Logon information of service accounts

Hi,

Account cleanup process is going on in our system. So we are disabling those accounts who didn’t login from last 395 days. We are fetching login information from lastlogontimestamp in AD.

We are facing the problem with service accounts, because service account can’t login into the system. Service account can only start or stop the service. So lastlogontimestamp can’t be updated for these accounts. Can anyone guide me that how can i filter the unused service accounts in AD.

Thanks in Advance

Abhishek