Sometimes it is necessary to add 2 mailboxes with the same name, when changing provider.
Some versions of outlook will not allow adding two mailboxes of the same name via the app and will say “mailbox already exists”
If you get this message when trying to add the mailbox, please proceed with the below:
Exit from Outlook
Go to the search box at the bottom left of the computer screen.
Search for Control Panel and open.
Change the “view by” to large or small icons.
Select the Mail icon
Select Email accounts
Select New
Fill in the mailbox details and hit the Manual Setup button, then next
Select Pop or Imap
Add the full mailbox details as below, click More Settings
Go to the outgoing server tab
Tick the box "My outgoing server (SMTP) requires authentication
Go to the advanced Tab and fill in as below.
Note that when you change the field to STARTTLS it may change the smtp port back to 25. Please change to 587
If you have any issues adding the account and get an error for the outgoing server – try port 465 SSL/TLS
Click Next
The account should now add
If you get the error message that the .pst file is too long, reboot the computer and start from scratch.
You should now have 2 email accounts showing. The new one will have (1) after the name. You can click and drag the new mailbox to the top, if you prefer.