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Exchange 2010 to Exchange 2013/2016 autodisover problem

Problem: There is a known error in Exchange 2013/2016 when you migrate user’s mailbox. After the migration is done use cannot access her new mailbox. It is possible after some time (max 15 minutes).

Cause: This is caused by outdated data cached by Autodiscover process on Exchange server. It’s called MSExchangeAutodiscoverAppPool.

Solution: You need to set application pool responsible for creation autodiscover XML file to recycle more often. You can do Recycle manually from IIS console after migration is done:

Manual Recycle

Or you can configure automatic recycling on specific condition. I most of the time configure Recycling on every minute. When all users are migrated I disable this rule:

Have a nice day,

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