Mail server Migration

[guruhs]

We have planned to migrate our existing Lotus Domin 5.x to Zimbra OSS 4.5.10. on RedHat Ent 5.0.I have setup zimbra and everything works fine. Now moving mailboxes across the server i am facing certain problems.

1) I tried to copy folder wise by configuring thunderbird imap for both servers. Initially i could copy couple of folders from old lotus to zimbra imap. After that i will not be able to copy anyother folders unless i exit thunderbird and restart.

2) Alternatively i tried imapsync. I can sync all the folders. Problem here is i am not able to get exact folder structure.

Example:
Old server
---------
Inbox
Drafts
Official
Dept
Incoming
Outgoing

and so on. That is nested folder structure.

But what i get on zimbra Imap
Inbox
Drafts
Official
Official\Incoming
Official\Outgoing

when i used the following syntax of Imapsync (version 1.99)

imapsync --sep1 '\' --debug --subscribe --syncinternaldates --noauthmd5 --host1 mail1.example.com --user1 testuser --password1 pass --host2 mail2.example.com --user2 test2user --password2 pass.

I am not able to create exact folder structure as above. Please suggest.

Thanks in advance
Gururaj