I am currently in Exchange 2010 and 2013 co-existence. I noticed for the pilot users in Ex2013, the user will set OOO and after some time they will come to me and say when someone emails them the sender will receive an OOO even though they did not configure OOO recently. Looks like it is using a previous instance of OOO. I am able to run a powershell command to disable it but obviously I cannot do this for each Ex2013 user. There's something really funky going on with OOO. Any sugges
Hi,
Does the issue happen to all users? It can't be determined why the OOF is enabled automatically in client side without further configuration. Please confirm the start time and end time of Out of Office configuration for the problematic users.
Also confirm whether there is any third party add-ins or program installed in client side. The users can also disable the OOF configuration in OWA by themselves:
https://technet.microsoft.com/en-us/library/aa997204(v=exchg.80).aspx
Re
I would check out the backend and see if Exchange thinks there is still an out of office reply set. You can use the Get-MailboxAutoreplyconfiguration cmdlet to check.
If there is you can use Set version of that cmdlet to get disable it.
https://technet.microsoft.com/en-us/library/dd638217(v=exchg.150).aspx