I have been working on different SearchFolders cases lately where customers were trying to create SearchFolder using EWS. Working on those issues has uncovered a limitation of Outlook (I tested it on 2007, but may exist with earlier versions as well)
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Here is a quick sample if you are looking at creating a search folder using EWS which will look for Custom Property. Here we are looking for a custom property named “EmployeeID” and make sure that the property exist and does not have a blank value. public
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