We are in the process of migrating off of an old e-mail platform we've been using for a long time to SmarterMail.  We've got around 40 domains and around 500 users.  We've got a list of domains/accounts/passwords, etc so setting all of that up shouldn't be a problem.  What is a problem is migrating the users existing mail boxes from the old platform into SmarterMail.  I know there's a way to do it a single user at a time.  Have tested that and it works just fine.  However, it just wouldn't be feasible to do that for all 500 users, and we don't want to leave it up to the users to do themselves as that is guaranteed to have 500 support tickets opened as everyone wants help doing the migration.  I've searched a bit to see if there's a way to do an en masse migration of multiple users.  I see old threads mentioning conversion tools to do the job, but the links in those threads are dead.  Does anyone have any suggestions or know where I should look?  Our current mail platform is Ipswitch IMail server.