username with dots making me dotty...

[Gobbledegeek]

Hello
       I've struggling with this for hours now...  
I pit unixheirarchysep = yes in my imapd.conf. 

I'm still unable to create user.name in cyradm. 
The message I get is either invalid mailbox name or permission denied...

I tried both user/user.name (invalid mailbox..) and user.user.name
(permission denied) for ex: user.j.smith .. no luck

cm user.name seems to work but I cannot access any mails from
client... like the doc says - top level names cannot be used.

I also tried altnamespace .. no luck. Why doesn't  cyrus work? 
With so many similar question on google - why isn't it properly
documented anywhere?

Any help will be appreciated.

-- 
Nonchalantly yours
GobbledeGeek
[Every thing but Gobbledegook.. !!]