This value is cached for high performance and reflects all of the known messages. If only part of the files for a session are loaded, the totals as of the latest file loaded are used. This means the count of items may exceed the actual number of matching messages in the messages collection if earlier files are missing.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2