Special Considerations
All of the property paths that we have been using in our examples refer to properties that are stored directly on the items being filtered (for instance, the subject of a message). However as you saw in Chapter 7, and Chapter 12, data about an item can also be stored within the recipient and attachment tables within the mailbox. We will now discuss the limited support for creating restrictions that consider the property values within these two tables.
Recipient Subfilters
Each message recipient in the To, Cc, and Bcc lines of a message will appear in the recipient table. MAPI surfaces the concept of a subfilter, which enables you to apply MAPI restrictions to records in the recipient table. Exchange Web Services does not allow ...
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