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answers:

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Trying to find emails from an inbox using exchange webservices (against exchange 2007). the subject of which should not be empty.

Tried the following:

searchFilterCollection.Add(new SearchFilter.IsNotEqualTo(EmailMessageSchema.Subject, string.Empty));

and

searchFilterCollection.Add(new SearchFilter.IsNotEqualTo(EmailMessageSchema.Subject, null));

but no luck. What do I need to do to get those messages that have a subject?