Microsoft revealed some interesting Exchange Online statistics at the MEC 2022 event. 300 K physical mailbox servers is a staggering amount, but 7.3 billion mailboxes might be even more surprising. Also at MEC we discovered more about the campaign to remove basic authentication from Exchange Online and how well Microsoft's Greg Taylor can communicate in Irish when he presents about the deprecation of basic authentication.
https://office365itpros.com/2022/09/15/exchange-online-statistics-mec-2022/
