Yes, you can re-activate an old user through the database (unfortunately, there's no way to do this through the UI). Like you mentioned in your previous post, deleting the user doesn't delete their record in the WTUser table, but just set's the value of the 'disabled' column to 1. If the user later needs to be reactivated, you just need to update the user's WTUser entry to set the disabled column back to 0. At that point, Windchill will see the user as disconnected. Then, you can just go into the Principal/Participant Administrator, search for disconnected users, and reconnect it to the LDAP account like any other disconnected user.
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