Users are prompted to restart outlook after the mailbox is moved to exchange 2013.

But what about mailboxes used by a application. We never sign in to those mailboxes.

I have seen applications which sends mail stops working with mapi error. I then sign in to the mailbox used by the application and receive the popup "your exchange made a change and you need to restart outlook and sign in" after the sign in the application can send mail again.

I have about 200  mailboxes used by different applications. Do I need to sign in to all those mai

No need to do that.

This case is only for "outlook client".

Because you change the endpoint to another exchange server , so outlook have to learn new topology.

• Proposed as answer by Supawat Rungsarityotin 7 hours 46 minutes ago
• Marked as answer by LSVO 5 hours 6 minutes ago