What happens if I delete and re-add an account?

I checked and the account exists for the WPMU site. It is activated however, the user reports that their password is not working. I cannot simply reset the user’s password because we are using the AD plugin to log users in against our Active Directory…

That said, I am wondering if I delete his account and then re-add it, if all of his old data will be orphaned.

Can you comment on that?

Thanks