mailbox doesn't download to Outlook Express

[#1]

I set up a couple of mailboxes today.  One works fine & sends emails to OE or Outlook if I want. However the others just won't work.  OE keeps throwing up that box asking for user name & password.  I've set up the accounts in exactly the same way in OE & am tearing my hair out!
One point which may be relevant - I had mailboxes set up with the same names as the new ones which won't work, but I hadn't used them for years & they were archived. So I deleted them & then set up new ones with same names - could this be problem?

[#2]

How long ago did you create the new mailboxes as it can take 4 or more hours before they become active. In some cases I have had to wait 24 hours before they work.

[#3]

They were all set up this afternoon - one after the other.  Thats why I can't understand that 1 works, but the others don't.

[#4]

Can you login to the mailbox using webmail? If not wait a while longer (i.e. 'til tomorrow) and try again.

[#5]

I've looked at webmail, but can't see anything & to be honest I don't know how to find specific mailbox in webmail - so I'm not sure I'm checking up properly.

[#6]

Login to webmail by entering username+mailboxname in the Name box and the password that goes with that mailbox in the Password box.

[#7]

The ones that don't work come up with unknown user or password incorrect.
The one that works though was literally set up 30 seconds before!

[#8]

As I said earlier, some can take longer to set-up - why I have no idea - but they do.
Try again in the morning with webmail.

[#9]

Thanks for your help.  I actually got so frustrated I deleted mailbox & reset it up.  It worked in about 30 seconds flat!!  Computers who says they don't have a mind of their own!