Granvillew - it sounds like the biggest issue for you is spam on your network - take a look at thread717-514043 How can we combat spam?"
A useful site is:
CAUCE (Campaign Against Unsolicted Commercial Email)
btw, A Computer Usage Policy gives 2 "things" -
1. It tells your users how you'd like them to use your network - they know when they're crossing the line
2. If a user crosses the line, you can take action against them legally & legitimately
You have to decide your trust in your end users - if you don't think they'll abuse the policy, word it however you like...just make sure your users can understand what you mean...
Given that (it sounds like) it's a corporate issue, you should probably pursue opt 2 - a legally enforceable Usage Policy...in which case, a) use SPECIFIC and QUANTIFIABLE language (e.g. Do not sign up to any mailing lists, Do not reply to unsolicited mail) i.e. don't leave ANY risk of ambiguity whatsoever, and b) Hand the end product to the corporate lawyers - after all, they have to enforce it.
As for issues such as
"retaining business related messages, use of tracking and proirity settings, follow up to unanswered messages" in the UK these issues are covered under ISO standards (e.g. "ISO 9002: 1994 Quality Management Standard"

.
The ISO standards specify what sort of tracking procedures an organisation has to use - again, check with your lawyers - if you have a standard / kitemark, you have to abide by it electronically as well as with paper transactions. <marc>
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