I quote this from O'Reilly's book
Windows Server Hacks:
Quote:
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One issue with hibernation can come up if your password is configured to expire periodically. The problem is that if your password expires while your machine is hibernating, you can't bring it out of hibernation to reset your password. To work around this, boot in safe mode, log on using the local Administrator account, and change the password for your ordinary user account, then reboot the machine.
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Moreover, I strongly advise you to keep your Windows fully patched and current; hibernation tends to bring up some issues with drivers incompatibilities and/or vulnerabilities, that are dealt with via updates.