[horde] MySQL migration (from imp 3.2.5 to 4.1.1)

[Bosco Tsang]

I am trying to upgrade the old version of Webmail (running imp 3.2.5) to the
latest version for horde (using imp 4.1.1, with new turba and ingo). Seems
like there are some different between the fields of the database (or moved
to a separated database in terms of ingo). I am wondering if there is any
migration tool around which can allow me to migrate the existing data over? 

Bosco