I’ve said it before but I’ll say it again, the lack of options for displaying to-dos in Leopard Mail is disappointing. And frustrating.
A poster in the macOSXHints forums has come up with a good work-around 
for avoiding that long list of finished tasks.
He has created a Smart Mailbox called “Not Done” which is set up to display all to-dos that are incomplete:
Simple, really. Why didn’t I think of that?
Enterprise Collaboration and Virtual Teams Report (November 29, 2007)…
The Technology Trends of Enterprise Collaboration and Virtual Teams Boeing’s Free Busy Connector for Exchange … Vladislaw outlines what he has learnt about Boeing’s free-busy extension for Microsoft Exchange Server: “First of all, Boeing have deve…