Outlook 2010 search function

Users on Win7 64 bit and users on Server 2012 terminal servers - Outlook search stopped working for some users.  It doesn't work for me or a few others on Win7 64 bit running Outlook on our PCs.  Terminal server users - some the search function doesn't work, some it does.  For those that it doesn't work, it seemed to quit about the same time.  
No OS updates run.
No Office updates run.
We're not running in cached mode.
I tried all the MS things in one of their KB articles.  No luck, at all.  

I'm actually wondering if I need to rebuild the problem user's mail stores on the Exchange server.
Scott MillerIT ManagerAsked:
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FOXActive Directory/Exchange EngineerCommented:
If your problems in outlook started within the last 2 weeks download the updated kb3097877
Clark KentSoftware Engineer cum BloggerCommented:
Hello Big,

Enable “Cached Exchange Mode” and see the results because in disabled mode, whenever your enter a query to pull up any data, Outlook have to pass that particular trigger through the entire Exchange server. That is why, sometimes it takes too much time to display results or sometimes does not show anything at all.

Feel free to ask further!!!

Clark Kent

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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
In Non-Cached Mode the Exchange Search index is used on the server. If it cannot find anything reliable for some mailboxes, then yes, you'll have to rebuild the index, as described at https://technet.microsoft.com/en-us/library/ee633475(v=exchg.150).aspx
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