Hello. We had Exchange 2016 RTM and decided to migrate to Exchange 2016 CU20. Everything is looking okay but when we migrate mailboxes to new server, to new database, user sees "We can't show MailTips right now" when he starts new message in Outlook. OWA works fine. I've tried everything i've found here to fix it, but still nothing. Interesting facts: if I migrate mailbox back to the old database, message disappears. Another thing: if I create new mailbox directly to new server and database and use clean outlook client, the message appears. Ideas?