Deleting Requestors

All,

Please could you advise on the following: -

1) If a user is disabled or removed from AD, and then I do an AD import into SD+, is that user removed from SD+?
2) If I remove a requestor or technician from SD+, what happens to all the requests\changes\etc attributed to that user?

I am using 7022 currently.

Thanks,
Davey