Searches for a given property tag in an IMAPIProp interface or an interface derived from IMAPIProp, such as IMessage or IMAPIFolder.
Client applications and service providers
[in] Pointer to the IMAPIProp interface or interface derived from IMAPIProp within which to search for the property tag.
[in] Property tag for which to search.
A match for the given property tag was found.
A match for the given property tag was not found.
If the property tag in the ulPropTag parameter has type PT_UNSPECIFIED, the FPropExists function looks for a match based only on the property identifier. Otherwise, the match is for the entire property tag, including the type.