Mails gone after moving
 

I've moved a customers account from one server to another with same OS and Mailserver version.

Mail directory format on old server was:

~/email/$domain/$user/mail/.imap/folders

on new server its

~/email/$domain/$user/.maildir

the old folder has been moved to the new and accounts are still working with same user and password but the old imap mails have been gone.

Looks like there has anything changed with isp manager and imap settings? How can i get those old mails back into the new accounts? Any converter tool or something available?

Frank