troubleshooting Question

Server 2008 R2 w/ Exchange 2010 rebooting every night....

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medium_gradeFlag for United States of America asked on
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Here's the server:

Server 2008 R2 Enterprise
Exchange 2010 Standard
Server is domain controller

Every evening at a few minutes after 1am, the server will simply reboot itself. I have searched the logs multiple times and cannot identify any errors that occur just before the reboot. I also do not see any schedule tasks or backup jobs that occur at that time. However, at 1-3 minutes after 1am (the time still remained the same even after the daylight savings change) the server simply reboots. Can anyone offer any insight as to what might be happening?

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