Couple notes:
- A/V products are *all* reactive, not proactive. You will always be behind the threats. Think about that.
- Take the time you won't spend patching and go home and see your family.
- If Exchange is so wonderful, why are ~70% of users still not upgrading to Exch '03? Why are 30% still on 5.5? For contrast, there are more folks on GW 6.5 than there are on Exchange 2003 due to the pitifully low uptake rate for msft. The obvious reasons are that upgrades are rip and replace (max cost, max risk) and that the newer versions don't offer enough value to make the upgrade worthwhile. At the same time, lots of folks put it in.. and are now stuck with it. Admitting you spent millions putting in exchange and then reccomending migrating could be viewed as a CLM.. or I think more folks would switch honestly.
What are the business drivers for changing? Both products have near parity on the feature/funtionality scale. Sequoia (due this summer) is going to support either client via a new 'shim' - Groupwise Win32 or OL2000-2003, so if there is some client issue going on you could save your money and wait 3 months. Sequoia also has some very cool calendaring features which I don't beleive OL can replicate.
Yes, you won't get to manage a dept running GW, bc one person can run the thing easily with thousands of users. And they will get complacent when email is always 'up'.
Did you know that most corp mail systems experience 8 hours of unplanned downtime a month? And that Exchange shops experience more than the average? GW was not used in these figures btw. And informal poll of admins from a GW listserve had most folks guestimating they were below 8 hrs of unplanned downtime a year.
I don't know the answer to your other question.. but I can say it's sad to even have to worry about something like that. If Exch used a config file that a human being could understand, such an issue would simply not exist. But instead, to attempt to 'hide' the complexity of the systems these settings get written in hex to obscure registry keys so that when something breaks you are SOL.
jm2c