[Samba] pdbedit -P 'maximum password age' -C 0 should == never expire?

[JustFillBug]

When I set the 'maximum password age' to 0, my password expired
immediately after I did a smbpasswd. Shouldn't setting it to 0 mean
the password will never expire? Or are there any other way to set 
password to never expire?

Here is the microsoft's interpretation on 'maximum password age':

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/proddocs/entserver/501.asp

It said 0 = 'never expire'.