Last updated: September 2016
When you search in a Public Folder that you've added to your favorites in Outlook 2016, no search results are returned or you may not see content in the Public Folder at all.
This issue is fixed in build 16.0.7766.2060. Please go to File > Office Account > Update Options > Update Now, to install the fix.
For more information, see this article: KB 3169741: No search results in public folder favorites in Outlook 2016.
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