topic Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic) in Email

Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Penny — Wed, 20 May 2026 04:07:17 GMT

The last few days have been transferring content of one PC (Windows10) to another PC (Windows11).

Most of the mail accounts in Outlook - those connecting to the servers at Mythic Beasts - transferred fine.

... however those with plus.com addresses would not work in Windows11.

The Plusnet help page https://www.plus.net/help/email-guides/how-to-set-up-plusnet-email/ says:

POP
Incoming server mail.plus.net
Incoming port 995
Outgoing server relay.plus.net
Outgoing port 587 (recommended) or 25
STARTTLS Yes

... I tried that. Wouldn't work, for any of the three plus.com addresses (which btw have all now been migrated to Greenby).

So I looked at the set-ups on the Windows10 PC.

The set-ups (which are currently *working* on that PC) are as follows:

POP
Incoming server mail.plus.net
Incoming port 110
Outgoing server relay.plus.net
Outgoing port 25
… no encryption.

(this one is working for one of the three plus.com accounts on the Windows10 PC).

POP
Incoming server pop3.plus.net
Incoming port 110
Outgoing server smtp.plus.net
Outgoing port 25
… no encryption.

(this one is working for the other two plus.com accounts on the Windows10 PC).

I am - somewhat - mystified. I can remember that setting up the plus.com mail accounts in Outlook for the Windows10 PC took an age, originally (some years back) because it wouldn't accept anything with encryption. However I don't specifically recall the 'pop3.plus.net' or 'smtp.plus.net' (only mail.plus.net and relay.plus.net which iirc had always been the settings from way back when).

... however Outlook does seem to have a habit of changing settings for no particular reason so maybe it had overwritten whatever I had put in originally.

It still doesn't explain, though, how the exact working settings in Windows10, simply do not work in Windows11.

Meanwhile - in the process of trying to set up the three plus.com accounts on the Windows11 PC - outlook regularly tried to use mail.enmail.co (associated with greenby afaik) for both incoming and outgoing server on the plus.com accounts, so it was clearly getting that address from *somewhere*, even though it didn't work.

Any insights on what combination of servers, ports and encryption settings might actually *work* on Windows 11 for plus.com mail accounts, would be very much appreciated

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

PhilipHeyes — Wed, 20 May 2026 07:15:23 GMT

For POP3 via :

Incoming server mail.plus.net
Incoming port 995

Encryption : SSL/TLS needs to be enabled,
in the older Outlook 2010 tick enable SSL encryption.

Make sure the Username is the full email address of the mail box for the POP3 or IMAP + SMTP servers
avoid the older <account>+<name> format and I'd avoid using an alias too.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

njay — Wed, 20 May 2026 07:27:00 GMT

You probably are but just to confirm is it also outlook classic on win11 pc?

Default outlook for windows 11 puts a cloud service in between which can cause issues

Details about it in Greenby FAQ which recommends on win 11 using outlook classic or another email client

https://greenby.com/support/knowledgebase/faqs

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

PhilipHeyes — Wed, 20 May 2026 07:49:32 GMT

We have the subscription version of MS Outlook & Office 365 on Win 11.
Changing the email settings via the Windows Control Panel with MS Outlook closed allows us to make adjustment reliably.

A clue that the updates are not working as expected appears to be revisiting the settings and finding the email servers have been updated to different & not functional values. AI & Automation is great until it is a hindrance !

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

jab1 — Wed, 20 May 2026 07:56:12 GMT

I don't know, so if I am wrong, ignore me, but does Outlook (any version) store settings in a profile which can be copied to a new machine? Only going off my Thunderbird program.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

PhilipHeyes — Wed, 20 May 2026 14:15:31 GMT

MS Outlook credentials are encoded in the Windows Registry, the path is specific to a given version of Outlook.

It might be possible to export & reload the Outlook registry data, but it is not a process that is promoted.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

jab1 — Wed, 20 May 2026 14:23:46 GMT

Fair enough - as I said, my suggestion - which won't work for Outlook, was based on my TB programs capabilities. It is ~30 years since I last used any version of MS Outlook.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Penny — Fri, 22 May 2026 05:27:13 GMT

@jab1 wrote:

... does Outlook (any version) store settings in a profile which can be copied to a new machine?

Sorry for the late reply, been occupied with much else the last couple of days, only been here fleetingly.

Yes, there is indeed a 'profile' as I discovered from https://www.zubairalexander.com/blog/how-to-export-and-import-outlook-account-settings/ How to Export and Import Outlook Account Settings (brilliant page). Years back (while the PHC site was being built) we had no less than six (!) hard drives fail in the space of a single year (combination of laptops and PCs) and my eldest son gradually found ways to retain and transfer mail accounts and inbox rules, by use of the Registry.

... so I'd figured this was probably what I needed, so as to get these items from the w10 PC to the w11 PC, and went looking for detailed instructions, hence the Zubair page linked above.

Also aware, dually, that messing with the Registry can be somewhat risky, and having already transferred to the w11 PC approx 100K current files as well as four .pst files containing e-mail from 2001 to present day, didn't want to risk stuffing things up so enlisted the help of "Copilot" (Microsoft AI afaik) for the registry sequence.

Initially I referred him/her (how does one term an AI? "it" doesn't seem quite right, so CP, I guess, ongoing, for simplicity) to the Zubair page, with specific relevance to the name of the Outlook profile needing to be the same on both PCs.

Then I asked CP to guide me through setting up a System Restore Point (so if things got stuffed up there would be a way of restoring the PC to how things were before we started).

Then we started the process ... and if anyone else follows this process, please FIRST see the final caveat (re name-of-user [not just name-of-profile]) highlighted in orange, further down this post).

It was all relatively straightforward First we checked the name of the profile, on both PCs - both said "Outlook". I queried whether this was "New Outlook" or "Outlook Classic" (the former was pre-installed on the W11 PC, the latter I had had to download separately from MS) and CP informed me that "the registry‑based profile transfer ONLY applies to Outlook Classic". S/he also said "Go to: Control Panel → Mail → Show Profiles - The profile name “Outlook” is the default name used by Outlook Classic, not the new Outlook."

... @jab1 I am well aware that the above paragraph is probably not of the slightest interest to you given that you don't touch Outlook with a bargepole lol but I've included it because it might be of interest to others reading this thread and CP did indeed give me a great deal of useful information along the way.

So I asked where to put the code

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles

And CP replied:

Where to put the registry path
You will paste the path into the address bar at the top of Registry Editor on the Windows 10 PC.
On the Windows 10 PC:
1. Press Start
2. Type regedit
3. Open Registry Editor

You will now see a window with two main parts:
• A tree of folders on the left
• A blank area on the right
• And at the very top, a thin white bar — this is the address bar

The address bar didn't seem to have any facility to allow the input of the requisite code, so CP provided a different way forward.

Manually expand the folders in the left hand tree.
You don’t need the address bar at all — we can get there by clicking the little arrows.
On the Windows 10 PC:
1. In the left panel, find HKEY_CURRENT_USER (you may need to scroll a little)
2. Click the little arrow to the left of it to expand it (not double click — just click the arrow)
3. Now expand these folders in order:
• Software
• Microsoft
• Office
• 16.0
• Outlook
• Profiles

Export instructions followed:

Under Profiles, you will see a folder named Outlook
That’s the folder we need to export.
Export the Outlook profile from the Windows 10 registry.
You’re still on the Windows 10 PC for this step.
1. In the left panel, right click the folder named Outlook under Profiles
2. Choose Export
3. When it asks where to save, choose Desktop (easy to find)
4. Name the file:
OutlookProfile-W10.reg
5. Click Save

Next set of CP instructions:

That’s it — you’ve now captured the entire Outlook Classic profile from the Windows 10 machine.
Our next job is simply to get that file onto the Windows 11 PC.
Since your mouse/keyboard don’t cross between machines, the simplest and cleanest method is:
On the Windows 10 PC:
1. Open File Explorer
2. Open your OneDrive personal folder
3. Drag OutlookProfile W10.reg from the Desktop into that folder
That’s it — the file will sync automatically.

... followed by:

Then, on the Windows 11 PC:
4. Open File Explorer
5. Open your w11 OneDrive personal folder
6. Confirm that OutlookProfile W10.reg appears there.

... at which point I asked:

... okay - before I do this, am aware that the .reg file on the w10 pc that I moved (dragged) to one drive is no longer located in the folder where I had created it. ... just wish to confirm that moving (dragging) the exported registry/outlook/profile file, to one drive, is not in any way going to affect the ongoing use of the registry/outlook/profile file by the w10 outlook program (?)

... to which CP replied:

Moving the exported .reg file will NOT affect Outlook on the Windows 10 PC
Here’s why:
The registry file you exported is just a copy
When you right clicked Profiles → Outlook → Export, Windows created a separate .reg file on your Desktop.
That file is:
• not linked to the live registry
• not used by Outlook
• not referenced by Windows
• not “active” in any way
It’s literally just a snapshot — like a photocopy.

Dragging it to OneDrive does NOT move anything inside the registry
You’re only moving the copy, not the actual registry data.
Nothing you do with the exported file can affect w10 Outlook unless you double click it to import it — which must NOT be done on the Windows 10 PC.

... so, to recap:

Then, on the Windows 11 PC:
4. Open File Explorer
5. Open your w11 OneDrive personal folder
6. Confirm that OutlookProfile W10.reg appears there.

... next set of CP instructions:

Import the Windows 10 Outlook profile into Outlook Classic on the Windows 11 PC.
This step is done on the Windows 11 PC, and it’s very simple.
1. Open File Explorer
2. Go to w11 OneDrive personal folder.
3. Find the file: OutlookProfile W10.reg
4. Double click it
5. Windows will ask: “Are you sure you want to continue?” Click Yes
6. It will then say: “The keys and values have been successfully added to the registry.” Click OK
That’s it — the profile is now imported.

... followed by:

Nothing will change visually yet — Outlook hasn’t read the new profile until you restart it.

… and this is where we hit the roadblock. w11 Outlook Classic wouldn't open.

This was the error message:

Cannot start microsoft outlook. cannot open the outlook window. the set of folders cannot be opened. the path specified for the file C:\Users\name-of-w10-user\AppData\Local\Microsoft\Outlook\personal-email@gmail.ost is not valid.

... because:

(filepath C:\Users\name-of-user\AppData\Local\Microsoft\Outlook) needs to be exactly the same on both PCs.

In W11, Outlook was not accessible initially *until* personal-email@gmail was signed in. At which point W11 Outlook Classic created an .ost file at C:\Users\name-of-w11-user\AppData\Local\Microsoft\Outlook.

... so when the settings changed - when the .reg file was imported - the .ost file at C:\Users\name-of-w10-user\AppData\Local\Microsoft\Outlook\personal-email@gmail.ost could not be located on the w11 PC. That gmail address being the primary one that use of Outlook365 was tied to. So Outlook refused to open.

CP disagreed that this could be the problem and said the registry file must be corrupted. S/he kept proposing what s/he thought might be ways of causing Outlook to open - two more hours and getting precisely nowhere - at which point I disengaged (politely).

After which I used System Restore and - blissfully - everything returned to how it had been before this experiment 😐 Twenty minutes, System Restore took, "repairing the registry", it said. But eventually everything back how it was initially and 25 years of e-mails intact.

... at which point it occurred to me that if I could create a (mock) folder tree in Users (in w10 PC) with the filepath C:\Users\name-of-w11-user\AppData\Local\Microsoft\Outlook\, and put a copy of the personal-email@gmail.ost file in that folder, I could then nominate that filepath for the .ost file for the personal-email@gmail account.

I got as far as building the mock 'folder tree' (in w10 PC), ie Users containing folder name-of-w11-user containing folder AppData containing folder Local containing folder Microsoft containing folder Outlook containing the .ost file, but at that stage I couldn't figure out (in w10 Outlook Classic) how to nominate a different .ost file location for that personal-email@gmail account. Though I did (before creating the tree) get as far as creating a System Restore Point for the w10 PC just in case switching the folder path for the central gmail account might stop Outlook w10 working 😕

I have since discovered (for all the mail accounts except gmail) that Start - Control Panel - small icons - Mail (Microsoft Outlook) - E-mail accounts - Email tab - click 'change folder' bottom left - next screen select New Outlook data file - and then (for me) disregard the offered Windows - Users - my name - documents - outlook files options (that MS Outlook presents), and instead click (on the left) Windows (C:) - (NAME) - aaa mail folders pst - and select from the three already-created .pst files for recent-years mail (.pst files transferred over with the other 100K files before all this Outlook stuff was started) I could divert the mail traffic into the previously-set-up intended storage-locations, and disregard the Outlook 'extras' just created.

With regard to the central gmail account, all that would have been required (w10 PC) was to follow the sequence Start - Control Panel - small icons - Mail (Microsoft Outlook) - E-mail accounts - Email tab - click 'change folder' bottom left - next screen select New Outlook data file and again disregard the MS Outlook options then follow the path from Windows (C:) to C:\Users\name-of-w11-user\AppData\Local\Microsoft\Outlook\personal-email@gmail.ost and select that file.

If Outlook w10 continued to work with the revised filepath for the central gmail account, I would have been relatively confident in re-exporting the Registry data and trying again

Paradoxically, the only way/route by which I discovered how to change the selection of .pst files was after finally giving up on the profile-transfer option and deciding to brave the long process of transferring 36 more mail accounts from w10 PC to w11 PC one by one. This took a while - especially as Outlook kept inventing servers and ports - but eventually all the Mythic Beasts addresses were re-created. However for more than half of the accounts, Outlook had decided to create a new (separate) .pst file for each account - so I then had to figure out how to cause those factors to be changed, hence the above discovery.

Meanwhile - eventually - it had occurred to me that if I could figure out how to re-name the User on the w10 PC to be identical to the User on the w11 PC (folder-name between Users and AppData) then the Registry export might well work fine, without any need of a mock-tree folder path. However I'm guessing that it's not just a question of re-naming that folder but instead of making the change at some very much deeper level (anything created on the w10 PC, be it Word docs or pdfs or whatever else has always had the author name 'name-of-w10-user') so maybe another Registry-type setting, who knows.

Maybe at some stage - next PC move, hopefully several more years down the track! - I will try the export route again, using what's been learned along the way. For now, just grateful that Outlook is up-and-running on the w11 PC, and life is returning to something like normal.

However I now need to figure out the plus.com settings as per the original post here, so as to get the last three mail accounts in place.

Thanks for all the replies so far - hopefully *something* will be found to work, sooner or later. Any insights from @plusnettony on the plus.com server/port/encryption settings would also be appreciated Whenever - no rush.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

jab1 — Fri, 22 May 2026 06:46:45 GMT

What a palaver, @Penny 😁.

At least you appear to have got somewhere, but it sounds unbelievably complicated - to me.

I moved my Thunderbird profile, with the assistance of 'MisterW' in about 10 minutes from my W7 machine to ZorinOS.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Penny — Sat, 23 May 2026 00:23:00 GMT

@jab1 wrote:

What a palaver, @Penny 😁.

Indeed 😁

Windows 11 is a palaver from start to finish.

Never understood before why people disliked it so much.

Though it's becoming gradually more usable as various elements are refined back to Windows 10 -type settings.

I guess I could always write a book on "Conversations with CoPilot"

Long road ahead, still, likely.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

MisterW — Sat, 23 May 2026 06:30:14 GMT

@Penny the problem isnt Windows 11 itself, from what I can see its Outlook on Windows 11 !

For instance I use Thunderbird, and moved my configuration to a new Windows 11 laptop with no trouble.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Dan_the_Van — Sat, 23 May 2026 10:48:14 GMT

@MisterW @Penny

using imap for my email client I have not encountered any issues migrating from Windows 10 to 11 or between platforms and OS

I use both Outlook 365 and Thunderbird for the same emaill address across Mint, Android and Windows.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Penny — Fri, 29 May 2026 19:44:14 GMT

@MisterW wrote:

@Penny the problem isnt Windows 11 itself, from what I can see its Outlook on Windows 11 !

@Dan_the_Van wrote:

I use both Outlook 365 and Thunderbird for the same emaill address across Mint, Android and Windows.

Well I don't know. The issue - for me, now - is plus.com mail accounts on Windows 11. Setting up all the other types of accounts did work - eventually - on w11 - but no joy with the plus.com accounts.

... but the settings for the plus.com accounts, shown in post #1 above - still *work* on Windows 10.

Have just sent (separate) test e-mails to all three, and all three arrived.

Meanwhile the settings on the Plusnet help page never worked (for me) on Windows 10 afaik, and still don't work on Windows 11.

I've just tried every variable I can think of, on Windows 11, and nothing - just nothing - seems to enable setting up the plus.com account/s.

I also went to look on greenby - where all three accounts have migrated and are operational - and didn't discover anything that looked like server settings, ports, encryption or whatever, or would have copied them across.

Going to output another request to @plusnettony if he knows any settings that might actually work on Windows 11, for plus.com accounts which have already been migrated (?)

Guessing it's probably a waste of time asking greenby : /

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

pvmb — Fri, 29 May 2026 20:52:17 GMT

@Penny

"I also went to look on greenby - where all three accounts have migrated and are operational - and didn't discover anything that looked like server settings, ports, encryption or whatever, or would have copied them across."

But they are all there, listed on the Greenby portal under Email Settings:

Email Client Settings (From Greenby Portal)

Incoming Server Address imap.plus.net
Protocol IMAP
IMAP Port 993 (Encryption Enabled)

Outgoing Server Address relay.plus.net
SMTP Port 465 (Encryption Enabled)

If you prefer to use the POP protocol rather than IMAP then please use port 995 with Encryption turned on

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

jab1 — Fri, 29 May 2026 20:58:56 GMT

AIUI, port 465 is depreciated and should only be used if 587 doesn't work - which it should do on any modern installation.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

pvmb — Fri, 29 May 2026 22:00:33 GMT

Cloudflare

What SMTP port should be used? Port 25, 587, or 465?

https://www.cloudflare.com/en-gb/learning/email-security/smtp-port-25-587/

Although port 465 is the recommended port for secure SMTP email transmission, some systems sometimes rely on ports 25, 587, or 2525.

Me? I'd just use the recommended settings, rather than rolling my own - which is what so many seem dedicated to doing.

But then, I don't use client email programs, so I can send and receive emails without any of these issues. 😊

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

njay — Fri, 29 May 2026 22:19:43 GMT

So reading that article

465 with SSL
Replaced by using 587 with starttls
And now (well since 2018) back to 465 but with implicit TLS.

No wonder there doesnt seem to be a single answer

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

Penny — Fri, 29 May 2026 23:34:17 GMT

@pvmb wrote:

@Penny

"I also went to look on greenby - where all three accounts have migrated and are operational - and didn't discover anything that looked like server settings, ports, encryption or whatever, or would have copied them across."

But they are all there, listed on the Greenby portal under Email Settings:

Email Client Settings (From Greenby Portal)

Incoming Server Address imap.plus.net
Protocol IMAP
IMAP Port 993 (Encryption Enabled)

Outgoing Server Address relay.plus.net
SMTP Port 465 (Encryption Enabled)

If you prefer to use the POP protocol rather than IMAP then please use port 995 with Encryption turned on

Do you by any chance have a link for the above settings (?)

I just went to look - again - to see if I could find them - and instead found this page: https://greenby.com/support/knowledgebase/article/29

So I tried those settings again - and this time it *worked* (for all three). Had tried those - along with very many other combinations - several times, and again today, earlier. What I think made the difference this time, was changing postmaster@ username.plus.com to username@ username.plus.com.

... so this might have been where I stuffed up previously (have always used postmaster@ or admin@, for previous mail set-ups). On this occasion, the first plus.com site tried, the above 110/25 settings were not accepted and I simply changed postmaster@ to username@ ... and it worked, instantly.

... so I followed the same process for the other two - which also worked, instantly.

Subsequently (as Outlook had created new, separate, .pst files for each) I had to follow the sequence previously discovered -

Start - Control Panel - small icons - Mail (Microsoft Outlook) - E-mail accounts - Email tab - click 'change folder' bottom left - next screen select New Outlook data file - and then (for me) disregard the offered Windows - Users - my name - documents - outlook files options (that MS Outlook presents), and instead click (on the left) Windows (C:) - (NAME) - aaa mail folders pst - and select from the three already-created .pst files for recent-years mail

... so as to group everything where it belonged, and then in Outlook right-click each of the surplus new folders to remove, but minor hassle compared with the long delays in getting these three accounts set up in the first place.

... and yes, they might even work now with encrypted settings, but disinclined to do any more tryouts, these will do perfectly fine as they are 😁 and they were never encrypted on the Windows 10 PC in the first place.

Thanks to everyone for the replies - and *soooo* glad this is all, finally, sorted, now.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

MisterW — Sat, 30 May 2026 06:30:39 GMT

@Penny

What I think made the difference this time, was changing postmaster@ username.plus.com to username@ username.plus.com.

... and yes, they might even work now with encrypted settings

Almost certainly the case. I would definitely try using encrypted settings. In this day & age its really not a good idea to be sending credentials unencrypted.

Re: Mail settings - pop3 / smtp - Windows10 vs Windows11 - Outlook (classic)

pvmb — Sat, 30 May 2026 08:37:46 GMT

@Penny wrote:

@pvmb wrote:

@Penny

"I also went to look on greenby - where all three accounts have migrated and are operational - and didn't discover anything that looked like server settings, ports, encryption or whatever, or would have copied them across."

But they are all there, listed on the Greenby portal under Email Settings:

Email Client Settings (From Greenby Portal)

Incoming Server Address imap.plus.net
Protocol IMAP
IMAP Port 993 (Encryption Enabled)

Outgoing Server Address relay.plus.net
SMTP Port 465 (Encryption Enabled)

If you prefer to use the POP protocol rather than IMAP then please use port 995 with Encryption turned on

Do you by any chance have a link for the above settings (?)

Yes, they on on your Greenby account settings.

Click SETTINGS tab

Email Client Settings