Has anyone else seen an uptick in broken MAPI sync connections lately? I've noticed over the past month or so an increase in support calls regarding broken Outlook connections. Customers have reported the classic "Your mailbox has been temporarily moved on Microsoft Exchange server. A temporary mailbox exists..." yadda yadda. As far as I've seen the only fix is to recreate the profile.

What I've been doing is adding the reg key ExcludeExplicitO365Endpoint 1 to the Outlook autodiscover hive, during a remote support session, and then recreating the Outlook profile. It works as a solution but I'm a bit mystified as to why this is happening more frequently lately. It's a fairly quick fix except for the time it takes for the customer's account to fully resync. I haven't upgraded since build 9229 in April. Most users are on either Outlook 2019 or 2021. I suspect it has something to do with Microsoft accounts somehow confusing Outlook but I don't know for sure. Anyway, just curious if this is a localized occurrence or if others have been seeing it also.

Matt