Microsoft Office Outlook 2003 - Systematically Improved

Microsoft Office is now the Office System, but that's about the only visible change if you don't count new toolbar icons — and Outlook.
Outlook gets a big deal of improvements with spam filtering, privacy features, virtual folders, and more great additions. Unfortunately, not all is good yet...
Microsoft Office Outlook works great together with other Office System applications and as an email/calendar combination, but Outlook also shines as an email client with great organizational talent (virtual folders, versatile searching) and solid spam filtering. (Windows)