Also, if you have password aging, set this account as the password never expires.
>I always recommand to use a specific account, one that you would create either on the server or the domain, depending on your needs and how the accounts are managed, so you can apply only the required permissions to what the service does. Then you can evolve the permissions as the service evolves
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer