The general practice seems to be to first check to see if the material has been returned. Then, a check of the patron record might reveal a new address. Some units try an alternate address from the patron record. If all else fails, units sometimes put a note on the patron record to the effect that the address needs updating. Judi Beland indicated that Countway sends out a standard form that is also available on the Countway web pages.
Some units send out lists from the previous year.
Reporting and batch products will require some modifications. There is no reason to use only DOS-based clients. Rumor has it that it will be discontinued on June 9. The purpose of the pilot project was to gather use and cost to assist individual Harvard libraries in deciding whether to offer a service of this type. MC will look into it.