Exchange 2013 Search Result Limit

We recently migrated a client with a large terminal server cluster from Exchange 2007 to Exchange 2013. Immediately users began to report issues with their search results returning only a very small amount of items. We have yet to be able to find a resolution to this through standard operations of rebuilding the indexes.

What I did find online was an article talking about a 250 item result limit that is some how hard coded into Exchange 2013 when your Outlook is in online mode. Is this true? Is there a work around or fix?
LSevenAsked:
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Amit KumarCommented:
Yes! there is limit due to settings in Outlook.

Please go through with this article and apply fix in your env. may help you.

Content from article:

You can change the Search options to show all results or edit the registry to increase the number of results. To show all results, go to File, Options, Search and untick Improve search speed by limiting the number of results shown.
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LSevenAuthor Commented:
Amit,

Thanks for the quick response, but unfortunately that setting does not effect search results in Online mode. It only effects search results in Cached mode. We have messed with it and we are still limited to 250 search results on search terms that should return 1000s.
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Amit KumarCommented:
So better to keep outlook in cache mode, why do you need outlook in online mode. Even I am working with an org and we prefer to use outlook in cache mode for thousands of users.
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Will SzymkowskiSenior Solution ArchitectCommented:
Unfortunately, this setting cannot be modified on the Exchange server itself, when you are using OWA or Exchange in Online mode.

Cached mode is preferred when using Outlook (as it is the default) for better performance etc. However I do understand your need when you are using Outlook on terminal servers, you do not want to download every mailboxes OST file.

If the user logs into another terminal server it will download it again. Trust me i know. However there is still no way around this as of yet for Exchange 2013.

Will.
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LSevenAuthor Commented:
Amit/Will,

Do you have any ideas on how to best run cached mode in Exchange for a RD server farm? My only thought is a mapped drive and a GPO to force a cached location, but I believe it is against best practice to store an OST over the network.

Thoughts?
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Will SzymkowskiSenior Solution ArchitectCommented:
Yes you do NOT want to store the OST on the network. This will also create slowness and also possible OST Corruption. In Outlook 2013 a new feature that they have encorporated is caching a percentage of your mailbox to the machine. So this might be an option to configure Outlook 2013 with a 20 or 30 percent cached mailbox. You can play with the setting to see what works best for your users.

Another though is you could add additional storage to each RD server specifically for caching the OST files. This way it is stored locally but not on the c drive.

Will.
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