Cant add my initial mailbox (same as my MS username) to Outlook(PC)

Copper Contributor

Hello Community :) 

Recently I got the basic Office 365 product and I installed it on PC. 
I setup Outlook and logged into with my Microsoft username (

Now i tried to get the initial gmx mailbox which is basically the same ( as IMAP but it says "this account is already used". 
The window which lets you decide between|O365|Imap|Pop3 does not open since it says it's already used. 

Is there any workaround?


Best regards 


1 Reply
What do you find when you go to and log in?