What would cause a user to exceed the maximum number of objtMessage objects?

I'm receiving EventID 9646 from MSEchangeIS: Mapi session "/o=Granite State Cabinetry/ou=First Administrative Group/cn=Recipients/cn=JKilar" exceeded the maximum of 250 objects of type "objtMessage".  What are some possible causes for this?  Could it be virus related?  
optimumpcAsked:
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florin_sCommented:
Hi,

This is from another site:

" As per Microsoft: "A single MAPI session has exceeded the maximum number of objects of a given type. To prevent a single client from affecting the performance of the entire server, this MAPI session was terminated". See MSEX2K3DB, M842022, M899663, and the link to "Veritas Support Document ID: 271186" for details on this event. "

here are the links:

http://support.microsoft.com/default.aspx?scid=kb;en-us;842022
http://support.microsoft.com/default.aspx?scid=kb;en-us;899663
http://support.microsoft.com/default.aspx?scid=kb;en-us;925815

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