Exchange 2013 mailbox migration – Outlook cannot connect

Migrating a mailbox to Exchange 2013 in an mixed environment from Exchange 2010 can cause Outlook to be unable to connect to the mailbox.

This is caused because the autodiscover data is not updated automatically with the new location of the mailbox. CAS 2013 servers are still proxying the request to the 2010 mailbox servers.

By recycling the MsExchangeAutodiscoverAppPool on Read more