removing inherited permissions from mailboxes

Hi all,

I have been trying to remove permissions from a user’s mailbox in A.D. under Mailbox Rights on the Exchange Advanced tab (windows SBS 2003 standard) but get the message “you cannot remove x because this object is inheriting permissions from its parent.” I can’t really find where the parent object is. The AD structure is the standard Domain.local>MyDomain>Users>SBSUsers, with all users being contained in the SBSUsers folder/OU.

Initially I thought this meant that the SBSUsers folder was the parent object but this doesn’t seem to be the case as inherited permissions are different. Any help would be appreciated.

Cheers,

Mac