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The advanced configuration will allow me to specify an SMTP user name but there is no way to configure the IMAP user name being different from the email-address.
Using New Outlook on Windows for professional communication and productivity
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Please don't spread false information! It doesn't help anyone; it just wastes time.
Sorry for you but it worked for me on 3 different email accounts that the email address is different than the username
Please don't spread false information! It doesn't help anyone; it just wastes time.
You are right! I also can't understand why the new Outlook doesn't support IMAP - unbelievable!
But just using classic Outlook (Outlook 365) solves your problem.
But - only until April 2026, unless you have special licenses.
I was able to do this via the control panel "Mail" option. I was not able to configure this via just adding an account inside of Outlook.
To be very, very clear - you were able to add a custom IMAP login name for Outlook (New) via the control panel Mail option???
Previously - that has only worked for Outlook 365 (aka outlook old).
If this is true - what version of windows were you using? This still isn't possible with Outlook (new) and Windows 10 for me.
In other words - this menu (Outook 365):
Has no bearing on the settings referenced here: (Outlook for Windows):
Where the IMAP login is "jsmith" - not "******@mail.com". With Outlook for Windows (aka Outlook (new)), there still doesn't appear to be a way to use an IMAP login that isn't an email address.
I was able to do this via the control panel "Mail" option. I was not able to configure this via just adding an account inside of Outlook.