Exchange & Mail: how to change username?

Bump on this. I have an Exchange account where the user name is "xxxxxx@schooladdress.edu" that set up on my Macbook Air. The account synced over to my iMac via "Internet Accounts" but ripped the "@schooladdress.edu" part off so Im only left with the prefix. And of course its all grayed out on accounts tab in Mail... *** guys! Let me make my own changes or don't change my user name for me.

Exactly same situation here.

I'm having the same issue. On my previous iMac it worked fine but I just bought a new iMac and can't setup Mail due to this issue. Moronic that you can't manually change information.

Delete the account, then add a new account, fill out the first page, then hold the option/alt key while clicking Create. This will give you a manual setup option.

I removed the account and re-added. That worked, however I didn't need to manually enter my information. It may of been a keychain glitch? Either way, it is working now.

The @domain.com is being stripped from the account user name when the account is imported from the internet accounts section of iCloud keychain. You have to delete the account and re-add it, but since it was added through iCloud keychain, when you try to delete it it wants to remove the account from all of your computers using internet accounts through iCloud keychain. The work around is to disable keychain access in preferences --> iCloud (on the computer with the issue), delete the mail account, re-add the mail account and then re-enable keychain access.

This resolved the issue on Yosemite. Thank you for taking the time to post this information.

Timothy,

The issue has NOT been resolved on Yosemite. We have 3 MacBooks running Yosemite and all of them have the same issue with different Exchange accounts. The Exchange accounts that are been shared via iCloud strip the @mydomain.com from the Exchange user name account. This is a huge problem, because the Exchange account are shared via iCloud with different devices.

jeff, I understand the issue has not been "resolved" in that the problem still exists. My error in is that the solution "Mike the Computer Doctor" posted on Dec 1, 2014 @ 16:48 resolved the issue on my systems. I have both a Mac Mini and a MacBook Pro running Yosemite 10.10.1. The issue was occurring on both of them. After unchecking Keychain in the iCloud settings, deleting the Exchange account, and then adding the Exchange account back into Internet Accounts, the problem was fixed. The Exchange account, in this case outlook.office365.com that requires the full username@domain.com, automatically inserted itself into all appropriate areas. I had to perform this action on both the Mac Mini and MacBook Pro. As you said, the issue has NOT been resolved on Yosemite, but this workaround does fix the issue. Thank you for pointing this out.

This method resolved it for me. Thank you! What a pain in the butt!

Thanks! This solved my issue too. Just took some time to find it after experimenting.

I have a Mac running Mavericks and one running Yosemite. On Mavericks I can just edit the user name, on Yosemite I can't. Shouldn't the settings on Mavericks iCloud itself over to Yosemite? Right now it doesn't.

On Yosemite, disabling iCloud Keychain, temporarily, worked for me.

I disabled iCloud Keychain, deleted the Exchange account in question, reinstated the account with the correct username, then re-enabled iCloud Keychain (authorising it from another device). Right now my entire Exchange mailbox is re-downloading.

@IVDV I would try disabling iCloud Keychain on both Yosemite and Mavericks.

You can then edit the username on Yosemite (after deleting the acct. and re-instating if necessary)

Then re-enable on both.

No Keychain data is lost as it's in iCloud.

That's what I'd try. This should work.

THANK YOU. This was very helpful. Turned off KeyChain, deleted Exchange account and reinstalled. it worked, but my signatures are gone. Not going to complain about that, although it might be a sign of something more significant. Exchange is now restored and running in MacMail on my new MacBook Pro (Yosemite). Headache over for now. ✅

Mike, thanks worked like a charm. Are you working on becoming an iWatch Dr?