2000 Server (Exchage) rebooted unexpectantly - Bugcheck

A client's 2000 server rebooted on its own yesterday morning.  The only message I could see in the logs was "The computer has rebooted from a bugcheck.  The bugcheck was:  0x00000044 (0x8792e288, 0x00000d39, 0x00000000)."

Any ideas?  I googled each code but nothing comes up.  HP DL380 G3
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are you running a gigabit network card
Run the error message on microsoft web site
here's the link with that error code

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