We use distribution lists located in the public folders of Exchange 2000. Sometime over the last two weeks, most of the names in these distribution lists can't be used any more. In Outlook, when you click on a name in a distro list, you get an error that the contact may have moved or been deleted. You can see all the names and their email addresses in the list, but you can't send email to them. In IIS, when you try to browse the contact list through OWA, you get an error message that says "names in the list cannot be resolved, and you must delete the unresolved names to send mail to this distro list."
I don't want to have to print up and recreate these lists manually, as there are a couple thousand names in 50 or so lists.