root can not delete a directory ,why?

[Realos <realos@loftmail.com>]

hi,

I am completely at loss. I can not delete following empty directory as root.

drwxrwxrwx   2 root root   8192 Dec 21 18:14 kolab

I tried "rm -rf kolab", "rmdir -f kolab", "rm -fd kolab" but nothing
works.
Error message is:

rm: cannot remove directory `kolab': Device or resource busy

There is nobody logged on the pc except for me with only one login. 

Is there a way to check if there hard links on that directory? Or do you
have any other idea.

Any idea is much appreciated.


-- 
Realos