The Deleted Items folder only contains 30 days worth of deleted emails. Last week, my boss unexpectedly needed to look for an item he deleted about 6 weeks ago, only to discover that all of his items over 30 days old were gone.
 
I have researched this extensively and discussed it with my IT support group, but have not been able to find any answers - and I can't figure out how to stop these messages from being automatically deleted after 30 days.  
 
I have Outlook 2011, an iMac running OS X (version 10.8.4), and am connecting to an Exchange 2007 server.  

I have checked the Mailing List Manager and Rules (no items listed in either), made sure the Schedule for Empty the Deleted Items Folder is disabled (was never enabled), and changed the policies set in the Exchange server to keep messages in the deleted items folder for 365 days (this was previously set to 14 days, so it did not appear to be having any effect, either before or after it was changed about a week ago).  But still, every day, messages over 30 days old get deleted.  I have also used owa to attempt to recover the deleted items, but they are no longer accessible so I believe they are permanently lost.
 
I don't think there is any way to recover what has been lost (and I have been advised on setting rules to move things to other folders before they can be deleted), but I would like to know if this setting can be changed in Outlook (since I have changed the relevant settings in Exchange without any effect).
 
Help!
Thanks!

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