Ok guys, got a little challenge here...

Let's say you have a large company with maybe a couple, several hundred laptops and workstations. Given the following factors:

1) Some abroad connecting via VPN, some local in-house.
2) All on the same domain.

The IT dept. has been through several techs over the past few years, and many computers have been removed, renamed, replaced, or added. As a result, you have an Active Directory structure that potentially still lists among its numbers computer names that no longer actually exist.

So now you have to audit AD and figure out the following:

1) Which computer names are still active?
2) Which computer names belong to computers that no longer exist, and therefore should be deleted?
3) Which users are on which computers?

That's more or less the situation I'm facing. Obviously I can't eyeball-audit every computer since some are abroad across the hemisphere. Note most computers in AD have usernames attached to them in the description, so the unidentified mystery computer names add up to a handful (thankfully).

So I need to figure out first, does the computer still exist, and second, who does it belong to?

Any thoughts?