Namespace problem

[Shuji Kono]

Hello,

I set up a new server and migrate cyrus mailboxes from the old
server on which I have been running cyrus without any problems.

I tar+gzipped /var/imap and /var/spool/imap and extracted onto
the new server. But when I tried to access the new server, mua
failed to get contents of inbox.

On the old server, imap command looks like this:
> 0002 NAMESPACE
> * NAMESPACE (("INBOX." ".")) (("user." ".")) (("" "."))
> 0002 OK Completed
> 0003 LIST "" "INBOX"
> * LIST (\HasChildren) "." "INBOX"
> 0003 OK Completed (0.008 secs 88 calls)

On the new server, INBOX is missing in the response:
> 0013 NAMESPACE
> * NAMESPACE NIL (("user." ".")) (("" "."))
> 0013 OK Completed
> 0014 LIST "" "INBOX"
> 0014 OK Completed (0.000 secs 1 calls)
> 0015 LIST "INBOX." *
> 0015 OK Completed (0.000 secs 1 calls)

Why do they give different namespaces? How do I fix it?
cyrus 2.1.11 is running on the old server and 2.1.12 on the new
server. 'altnamespace = no' on both servers.

Cheers