Hitting the Million Messages Limit in an Aggregate Group Mailbox

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MVP

A curious problem happened when a mailbox reported hitting a folder item limit (one million items). The mailbox was an aggregate group mailbox, a system mailbox used to make it easier to search Microsoft 365 Groups. Microsoft now uses a different method to search group mailboxes and will remove these arbitration mailboxes by the end of 2021. If you meet the problem, use a mail flow rule to stop messages being delivered to the mailbox..

 

https://office365itpros.com/2020/12/23/million-messages-aggregate-group-mailbox/

2 Replies

You pasted the wrong description :)

@Vasil Michev The worrying thing is that I have no idea where that blessed text came from...