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Create Outlook user properties from EWS

user1319
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user1319 Published in June 21, 2018, 8:42 am

I'm trying to create an application that determines properties of emails that come into an Exchange inbox and stores the properties of the email in UserProperties so they can be viewed in Microsoft Outlook.

The only way to set UserProperties of an Outlook email that I'm currently aware of is through the MailItem object in the Outlook Addin API. However, I don't want the setting of these properties to rely on the user having Outlook open so the Addin can run. Ideally, the setting of the user properties would happen regardless of whether the user opened Outlook or not.

With that in mind, I turned to EWS, a library for accessing Exchange emails through the Exchange server instead of Microsoft Outlook. Unfortunately, the EmailMessage object in EWS exposes a different custom properties object (ExtendedProperties) than MailItem's UserProperties property. Because of this, I'm not sure how to set UserProperties in EWS.

I found this StackOverflow answer (Access Outlook user properties from EWS) that shows how to get user properties that are already set. I would like to set user properties for an EmailMessage that haven't been set before.

So the bottom line question is: How do I set UserProperties of an EmailMessage using EWS?

Thanks!

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