This can be done using active directory. Assuming you are using a MS domain, you go into Objects and applications in the active directory policies. There you control most aspects of users. The easiest way is to administer this is to send instructions to everyone with simple instructions to use MS Word as the email editor. This uses spell check inherently. If you are not careful, making it a domain wide policy can create frustrations larger than mispelled words.
Edited by MS Network Pro, 24 November 2005 - 12:13 PM.