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Problem: Outlook/MAPI never call Shutdown on the wrapped store. Also, we see a crash in mspst32!PSTCrashRecovery during process close.
Fix: The two are related. In CMSProvider::Logon, a CSupport object is created but never released. This leak keeps our provider alive (no shutdown) and messes with the PST provider's open PST tracking scheme (the crash). Fix is to release the CSupport object after handing it off.