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212

answers:

2

In researching how to use Exchange Web Services, I see examples like this

Dim PR_DELETED_ON As New ExtendedPropertyDefinition(26255, MapiPropertyType.SystemTime)
Dim PR_SEARCH_KEY As New ExtendedPropertyDefinition(12299, MapiPropertyType.Binary)

That first parameter is an int that represents the property ID. Can anyone give me a pointer to where those ID numbers are defined?

+1  A: 

Have a look at Outlook Spy. It can tell you those numbers. There is a screen shot on that site that shows how to get them.

Tomalak
This tool was very helpful. It shows lots of good info on each message and folder. And best of all it's free.
Dave C
+1  A: 

Those are called Microsoft Exchange Property Tags and can be found here

Alfred Myers