Exchange Account disappears in Mail

Same story here. Removed all the exchange references in the keychain, still the same story. Exchange account gets created and starts downloading emails, then mystically disappears. Tried several time, always the same result. Installed MS Outlook and added the account, works perfectly, just can link the Apple calendar to it. Tried to create the account out of Apple calendar, same. Started to work, then disappears. Tried also to create an application password in the Exchange settings online. Does not work either. This is a big bug of 10.14.

I have this same problem. I have a large Exchange mailbox and it adds it and starts downloading messages,,, and then half an hour later it prompts for my Exchange password again and then removes the account. I've tried removing and re-adding the account. I've tried manually deleting files following these instructions: https://appletoolbox.com/2018/09/mail-not-working-after-macos-mojave-upgrade-how-to-fix/

I had our professional IT guy work on it, and he's stumped. He tried deleting different files, re-installing....

I finally gave up and switched to Outlook. Would love a fix....

Now I can select Calendars only (at least, it appears to work — I'll let you know if this is stable). The difference from before was that I didn't select Contacts. Maybe that's the problem?

I have the same problem with workplace Exchange account that is hosted on outlook365.com. My security is handled by my institution using Shibolleth login.

Things I've tried that don't help:

(1) Deleting Keychain entries

(2) Logging in manually instead of automatically.

(3) Rebooting

(4) Entering account via system preferences vs. via OS X Mail.

I can get my mail on my iPhone and on my Macbook Air, but the account disappears on my desktop iMac.

Hello ppl, after tons of attempts i finally got my personally best set-up.

As i read before the crucial fork is the automatic vs manual configuration:

At this point i got this:

• MANUAL:

1. you have to put your password directly
2. it's "less" exchange then manual
3. i can flag every option as contacts, notes... (which i prefer)

• AUTOMATIC:

1. you login through the Exchange window
2. i can flag only mail and calendars (not enough for me)

I've tried everything, rebooting, removing all exchange keys from keychain, entering account from osx preference panel vs mail panel, E-V-E-R-Y-T-H-I-N-G.

So i'm pretty sure it's a mojave bug.

I run through this issue only now because I've an other problem. A specific exchange shared calendar disappeared form iCalendar, i see events where i'm invited but i can't see anymore this Shared Calendar.

After the configuration i still have this issue.

Good luck at all !

I am also having this problem with one of my exchange accounts. It started by telling me that I needed to re-enter my password and would not accept it even after several days of trying. I finally removed the account and was able to readd it. Since then I have had to frequently readd it because it will only stay in the mail app long enough to sync before removing itself again.

This is very frustrating but it's reassuring to see that I am not the only one having this issue.

I tried the same thing manual vs. automatic - so far this has worked for me as well, even with mailbox, calendar, notes, etc. all checked.

Hi Becky. I have the same problem on my 2017 MacBook Pro running Mojave. This is my work computer, so I can't just change user. On my private 2015 MacBook Pro, it works like a charm. Please notify me when you have a solution to this problem. Thanks.

Having an identical problem. Is there way to get apple to answer this "class action" question, vs individually calling them (that did not get me far beyond "reinstall OS and call us back"? There clearly seems to be a widespread problem.

I'm having the same problem. Exchange mail, calendar, contact etc worked just fine until yesterday I reset my password. Now I'm in the same pain as everybody on this thread: it disappears after a few minutes. I have 2 other Exchange accounts from other domains which still work just fine.

Mail also says, in the left bottom corner below my accounts, that I have 6501 new messages. I have only 1500 messages in all my inboxes added up. Weird!

I tried:

Setting up manually and just signing in - no difference.

Rebooting - no difference.

The PW for the account. I did that at our hosting party, being GoDaddy, and then in the Mail app as well.

At first I just changed the PW in the mail app.

Later on I removed + re-added the account.

The result was the same: it disappeared after a while.

@ gunter209, you found a better solution than mine, disabling the keychain in iCloud works better. My solution of not selecting the Contact to sync with Exchange only last until I close Mail. Once I restarted Mail, Exchange was gone in the wind !!

Nice bug from Apple !!

Thank you! This is a huge help. So far (fingers crossed), this appears to have fixed it.

Assuming this continues to work for a few days, may I now turn keychain sync back on? Or is it safer to leave it off?

Same here, after trying all the workarounds above. It started with Mail not being able to verify my new Exchange password. I have then deleted the account from System Preferences, but never managed to re-create it for longer than 2 minutes.