Check if AD accounts has not been logged into for 3 months, regarding VPN Logins

We have an old Radius server that will be going off line soon used for VPN access. It is a Windows 2000 Server and all accounts were created on the 2000 AD platform.
I need to do an audit on how to check if an account/login has not be used for 3 months, so i can disable the acccounts. (I have over 500 accounts)
Any ideas how i would do this? Let me know if you need anymore info
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Ernie BeekExpertCommented:
You could try usrstat:

Quote: This command-line tool displays the username, full name, and last logon date and time for each user in a given domain.

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LCMauriceAuthor Commented:
Ernie BeekExpertCommented:
Glad I could help. Thx for the points.
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Windows 2000

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