[Dovecot] invalid mailbox name

[Vincent Schut]

Hi,

while migrating all mail from our old to our new server (using 
offlineimap, imap -> imap), I get the following error for one of my 
user's mailboxes:

ERROR: Folder 'Organisations.RS Env & IJRS'[local_hoekman] could not be 
created. Server responded: ('NO', ['Invalid mailbox name: 
Organisations.RS Env & IJRS'])

I suppose this is because of the ampersand in the mailbox name? Because 
other folder with spaces in it go just fine...

Is this a fixed thing? Why was my user able to create the folder once? 
And why is dovecot 1.2.15 refusing to create the folder now?

Migration is from dovecot 1.1.11 to 1.2.15.


Thanks,
Vincent.