QuoteWill my old board still be running and fully functional on its current url?
Yes your old board will still be running, the converter does not alter your old board in any way.
QuoteWhat happens to the mods?
I have membermap on the old board, will i have to reinstall this for everyone to start again?
The mods for YaBB are incompatible for YaBBSE and you will have to find/use the YaBBSE mods for your YaBBSE board. There is a membermap mod in the completed mods board so long around in there for it. Your old membermap data will not be convertered so you either have to start it all over or find someone who will convert it for you.
QuoteOnce complete, what is the best way to redirect my users to the new se board url?
One way would be to use a redirection script written in perl, I can't remember the url off hand but you might be able to find it by searching, or someone might be kind enough to post the code I wrote for it.
If you have any other questions don't hesitate to ask.