I'm running Exchange 5.5 sp4 on an NT4 sp6, the users are on outlook 98 with all updates & patches. In the last couple of weeks some users have been able to go to "File\Open\open other peoples folders" and open some other users inboxes. At the moment we have 11 users who can all get into each others mailboxes even though no permissions or delegate rights are set to allow them to, neither are they in the same DL's or Groups. I have run ISINTEG and Consistency Adjuster to no avail.