Comment 5 for bug 12289

I found a way to bypass the freeze.

I moved the ~/evolution folder so that it won't try to convert any longer old data, then I had to
remove also the contents of the addressbook entries already half-migrated (rm
~/.evolution/addressbook/local/system/*)

Then it finally ended the migration, my mails folders are there... and I'll be able to work although
I lost my addressbook in the process (not that serious since mine is on a PDA actually).

Hope this helps.