The standard answer is to contact Mercury and ask them. That's all I know. Maybe when the interviewer asks it you should just tell him the revisions that you are familiar with and the experience you have with them.
Success is the ability to go from one failure to another with no loss of enthusiasm.
~ Winston Churchill ~
I believe it's a common interview question in consulting firms. Also, the information helps with getting your jobs and TD versions straight if there is a discrepency of some sort...e.g "From 2000 to 2001 I administrated TD8 for 500 users" [img]images/icons/smile.gif[/img]