help setting PN email up

[#1]

up till now there has only bein one mailbox on my PN account and iam having trouble setting a second mailbox up.
The problem is that i set new mailbox up and setup windows mail(fresh on diffrent computer to what the oraginal mailbox settings are on) but when i log in to collect the email of the new mailbox iam all so picking the oraginal mailbox's up to
any one got a clue which setting i have set wrong/overlooked?

[#2]

If you login to the two mailboxes using [url-http://webmail.plus.net]Webmail[/url] I'm presuming the contents of the two mailboxes differ?

[#3]

sorted now. abit  was using wrong login. i was using the new mail box's name with its new password and getting no connection to server. so was using the oraginal mail box's (post master) login's deatils to pick the mail up.
didnt know i had to use this as username (new mailbox name+oraginal username) 
can some one still explain why when i was using the oraginal username and password i was able to pick up the new mail box as well as the old?

[#4]

Quote from: ASBO

can some one still explain why when i was using the oraginal username and password i was able to pick up the new mail box as well as the old?

From the Manage My Mail pages when you create a mailbox:

Quote from: Manage

Add mailbox confirmation Thanks. You've successfully added a new mailbox. Please allow up to 30 minutes for this change to take effect.