Hi Susan

The Last Activity Date is updated whenever the customer master record is updated. This includes going into a customer's record and clicking OK (even if you don't make a change), posting a transaction to the customer's account, importing a customer record, or a change due to a database conversion. It is a fairly useless way of determining which customers should be marked inactive.

The best approach is to export to Excel the list of customers you want to weed out, including the dates you want to use as filters, and include the "Active?" field in the export. Change those you want to make inactive to F, and then import the list back.

Steve