one user crashes store.exe

when one particular member of the active directory logs on to the network, the Exchange 2007 Server crashes.
It happens every time repeatedly.  I've told this person to not logon for now, but how can we resolve this?
log:  
ERROR: MSEXCHANGEIS 9658 General --- The MS Exchange Information Store encountered an unexpected exception 0xC0000005 at address <HEX> while processing a request for user <username>
---Next line
ERROR Service Control Manager Eventlog Provider --- The MS Exchange Information Store server terminated unexpectedly. It has done this XX times.


Any ideas what could be causing the entire information store to crash because of one user?
lvnvAsked:
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lvnvAuthor Commented:
PS -
Server 2008 running
Exchange 2007 SP1 Rollup 3
IIS for OWA and ActiveSync
There is nothing else running on this server --> no AV, no AntiSpy, not Domain Controller, etc...
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leegclystvaleCommented:
It would be cheaper to sack the user and delete the account :o)
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lvnvAuthor Commented:
BUMP

Anyone?

Answer this question and I'll give you 500 point...

How can MS even put out a product that can act like this --- where one user crashes the information store?

Maybe that's a more pertinent question anyway...

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lvnvAuthor Commented:
no answer
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