Mail issues MS Exchange in Apple Mail / macOS Big Sur 11.0.1

Similar issues here. Just updated to Big Sur over this past weekend on my 2019 iMac and the problems started. Before that I had no issues. Was running great. Now, Mac mail appears to send and receive all of my mail from both my me.com account and my Outlook 2010 Exchange account that I use for work. However, when I check the office computer through Microsoft Remote Desktop the mail that I read in Mac Mail on my iMac or my iPhone, appear unread, the mail that I sent does not appear in the sent mailbox, and any mail that I have moved into a different folder has not moved on the Outlook computer. Very frustrating. I do not want to work from the Outlook computer as Mac Mail is just easier. Any help on this would be appreciated. Thanks. And .... Happy New Year.

It's now been two months, and lots of people on Big Sur having trouble with mail sync with exchange. On IOS devices mail works fine, both incoming and outgoing. On Mac, outgoing mail is fine, mail does not arrive. Taking offline, closing mail and restarting, with our without option key, does not help.

Please get on and fix this.

It is very upsetting that nobody in Apple addressed this issue yet, very disappointed with Big Sur update... I bought a new iMac and can’t even use it. Working from my old iMac, again, very disappointed

You might experience also issues if you work with multiple devices. Flags are working again but if you sent an email from a Big Sur device you won't see it on sent items on other devices. I kept my old iMac and it is working just fine. So the issue is with Big Sur.

I am having the same issue and it is driving me batty. My gmail messages load correctly and outgoing messages from all accounts are fine. Mail will not load Exchange messages. I am finding that the fastest fix is to use Rebuild, which quickly loads all of the new messages. Perhaps it is because I have now used that feature so many times per day, but I am not experiencing delay in the rebuild. Pressing Get Mail is useless, as is quitting and relaunching Mail.

APPLE PLEASE DO SOMETHING. THIS IS UNACCEPTABLE AND REQUIRES IMMEDIATE CORRECTION.

Same thing on BigSur 11.1 for me. I have an exchange account using mail ap on both a brand new iMac 27" 10-core i9 and a 2016 MacBook Pro 13"

All of a sudden today nothing new hits the inbox. I did notice that sent items are getting synced, but the inbox remains stale. This is pretty horrible and need a fix, fast.

there's an 11.2? I thought 11.1 was the latest.

Also, mail has inexplicably begun working with the exchange server. Mail stops retrieving new messages sporadically so I still need to use the outlook web app to be sure I dont miss anything.

The flags are syncing across the devices, I still have to check if send emails from big sur 11.2 (downloading) are syncing too, perhaps was an issue resolved in the back end of Microsoft Exchange :) however I am happy to this issue getting better

Well, as of 2/11 this problem is back in a real way. No updates on exchange accounts in Mail, again :(

sends are working, folder moves are working, flags are working...but no inbox updates. Have to go back to rebuilding the mailbox as a way to "check the mail"

Sad, this was actually fixed for like 4-5 days.

Today, my machine updated to Big Sur 11.2.1and mail problem is not compleet. I have not had a new exchange mail since 8 this morning, except stuff to my junk folder. The inbox in my IOS device is fine, receiving all mail right away.

PLEASE HELP APPLE. The mail should work.

Same issue here. I have deleted completely exchange account and set it up again. It worked once and that's it, does not receive new mail anymore. Spark.app on the other hand, no issues so it must be within Mail.app.

I'm having the same issue and it started immediately after updating to 11.2.3 - that is Mac Mail stopped talking to Microsoft 365. I've worked through more troubleshooting steps than I care to remember and still no luck.

Interestingly, I downloaded and installed Office 365 and when I try to add my Microsoft 365 account I get a credential error. This is strange because after I put in the password for our ADFS, I then complete MFA and it fails. Normally, if the credentials are incorrect it fails before MFA.

So no email for me on the Mac. Lucky my Windows 10 PC works just fine. Come on Apple - you're killing us!

Sorry...doesn't seem to be responding to that key command now...

I have the same issue and I was wondering if there is anyway to report this issue to Apple directly?

Also, if you use flags in your exchange account it will not sync to your other devices