Our company typically expires services 12 months from the purchase date.  The language in the contract clearly states that we will do this.
However, if there are large chunks of services left we will typically alert the Account Executive to offer an extension if the extension request meets certain criteria (Services are currently being used, active project is scheduled in the next couple months).

Question to the group:  How do you handle expiring services?  Do you alert customers or just have a hard fast rule on expiring them?

Thanks.