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Store.exe on Backend Exchange 100% CPU causes Front End W3WP.exe 100% CPU and requires IIS reset to release

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Last Modified: 2012-05-09
Our Exchange Environment has a Front End and Backend Exchange 2003 SP2 on Server 2k3 Standard. All Has been well until 1 week ago. No changes were made. etc.
We have since ran updates on both systems and applied the following MS patches as a result of our issue:
KB941439, KB970103, KB920760

Our Backend Server will crank up the CPU on Store.exe every 5-15 minutes or so (no set time has been noticed). The Server Handles the processing and returnes to normal in 1-2 minutes. When the Store.exe on the backend server returns to normal, the w3wp.exe on the frontend server spikes to 100% CPU and will not release. We then run IISreset.

We have tried with and without our current Symantec AV configuration with no changes.
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