Q: A user who was invited to a meeting opened a confidential attachment in the meeting invitation. Is there a way to prevent certain users from viewing confidential attachments? We’re using Exchange Server 2003 and Windows Server 2003.

A:The only effective way to protect against that kind of attack is to use Windows Rights Management Services (RMS) to protect the documents you want to attach to meeting invites (in Microsoft Office Outlook 2003 or later). RMS requires you to have Microsoft SQL Server and some other prerequisites, and there are client and server components that you need to install.

For more information about RMS, see these Windows IT Pro and Exchange & Outlook Pro VIP articles:

Also see these Microsoft resources:

Paul Robichaux contributed to this answer.