Thanks for this. Yes, we try to implement many of those same settings on the Windows Client. However a couple of things to consider before enabling all options like this;
1. Show Group Labels - When we do this by date, users like the look. Power users *hate* it as those with many thousands of emails in their Mailbox hate the additional second it takes to sort by group. Sometimes the additional second makes them click on the group label header or an email they did not wish to select as the mail stack moves up or down after the sort is finished. Additionally, when the Group Label is by date, The Date column itself is redundant - we've been asked for Time only and that doesn't appear to exist by default.
2. User Training Aide. Help the help desk at all companies. Consider linking some new GroupWise training PDF's or something similar (something like the old Brainstorm videos would work fine too, or just recorded screencasts linked to YouTube perhaps). Provide Just basic, quick training for "What's New" and show the user what is changed and how to use the features...
Good ideas overall and thank you for sharing!