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Exchange 2013 SP1 co-existence Exchange 2010 SP3 Roll up 4 Out Of Office not working for Exchange 2010 mailboxes

We have coexistence of Exchange 2010 SP3 and Exchange 2013 CU3. Outlook Anywhere and Autodiscover point to Exchange 2013 CAS server.

Outlook Anywhere with Exchange 2010 mailboxes are able to connect via Outlook 2010.

The only issue is when Outlook Anywhere is being used from Internet or from Internal network and user goes in Outlook 2010 -> File -> Automatic replies get the following error: –

“Your automatic reply settings cannot be saved. The server might be unavailable, or your automatic reply message might have exceeded the size limit on the server”

This issue occurs only if the connection passes viz Exchange 2013 CAS. Also It works fine if user mailbox is on Exchange 2013 Sp1

 

Ans: The following resolves the issue.

On E2k13 CAS server à IIS manager

highlight EWS virtual directory and select Configuration Editor

In the drop down, select System.WebServer/ServerRuntime/

Then in the middle pane select UploadReadAheadSize and set it to 49152

Do an IISReset

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