Q. The folders on the Math email server are still visible on
Thunderbird.  Will that be a problem?

A. The migration process does not delete your email from the Math email
server.  It is probably best if you do not use Thunderbird until the
configuration file has been set up to use the campus email server.  In
the meantime you can check the status of the migration by logging back
in to http://go.illinois.edu/migrate .