Glen's Exchange and Office 365 Dev Blog

Searching on the Categories property of an Email can pose a challenge because this property is a Multi-valued String property (which aren't that common in email) eg in a Message the property may look like the following So this needs to be queried in a different way then a normal String or single valued property in an Email would, where you could use a number of filter options (eg equal, contains,startswith). In EWS it was only possible to query this property using AQS because of the way SearchFilters translated to the underlying ROP based restrictions used by the Exchange Mailbox Store. In the Microsoft Graph the Linq format in Filters does translate more favourably so can be used eg the following simple query can find Messages in a folder based on a specific category https://graph.microsoft.com/v1.0/me/messages?filter=Categories/any(a:a+eq+'Green+Category') you can create a SearchFolder based on this query which would search all folder in a Mailbox which would produce...

Search Folders are a feature of Exchange that allows you to have a static search based on a particular criteria  across one or more folders in a Mailbox. They can serve a number of different functions within a Mailbox and are often used to provide some of the backend functionality of new features. None of the Exchange Management Shell cmdlets gives you  a good view of the SearchFolders in a Mailbox so EWS can be particular useful for this. Eg I've put a cmdlet together that will enumerate all the Search Folders in a Mailbox (or Archive is you interested in that) and produce a report of the folder number of Items and Size of those items that match the Search Folder criteria. It will produce a report such as I've put a copy of this script up on GitHub here https://github.com/gscales/Powershell-Scripts/blob/master/SearchFoldersEnums.ps1 To Run the script use Get-SearchFolders -MailboxName Mailbox@domain.com to Get Searchfolder from an Archive ...

In the past I've posted some examples of creating SearchFolders in Exchange with EWS and Powershell in the following post ,  in this post I want to cover some more advanced things you can do with EWS and Search Folders. The first thing I want to cover is how you change the option on a Search folder from "Show number of unread items" which is the default when you create a search folder in EWS to "Show total number of items". eg To change this option you need to set the PidTagExtendedFolderFlags property which is documented in http://msdn.microsoft.com/en-us/library/office/cc839880(v=office.15).aspx  . This is a binary property and you set this particular option by changing bit 6-7 in this property. Because you also need the SearchFolderGuid in this property the easiest time is to set this is right after you create the folder. eg $searchFolder .Save( $sfRoot .Id);   $PR_EXTENDED_FOLDER_FLAGS  = new-object Mic...