Thank you very much for your replay Charlie,
Is there any chance to just copy (scp) content form one old mail account to the new one?
I'm facing differnet mailbox format in 6.01 versus 5.6 and this makes the imap account not working properly.
There is just couple of accounts to solve (5 from 60) since their users choose to use imap. Other have pop3 and no problem at all.
thank you
Br
Damjan