OUTLOOK/EXCHANGE 2003 vs BASIC EMAIL
  Exchange Server 2003 POP 3 / IMAP4
Group scheduling
Send out meeting requests, then track and update them
Shared calendars and side-by-side calendar views
Access to personal and shared address books from remote locations
Outlook single sign-on for email and network access
Outlook connections over the Internet are secure Some solutions
Server-side spam filtering Some solutions
Put multicolored flags next to emails as a reminder to follow up Partial
Ability to add voting buttons to a messages
Automatic out-of-office reply
Ability to recall sent messages
Support for multiple-computer access Partial
Access to email via Web browsers and mobile browsers, Outlook Mobile in Windows Mobile-based Pocket PCs, Pocket PC Phone Edition and Smartphones Non-Microsoft products are typically required
Outlook Cached Exchange Mode for working with intermittent Web connection (eg dial-up) Some solutions offer caching
Offline email, calendar, contacts, and public folder support Partial
Access to public folders for sharing documents and information Individual email folder access in IMAP
Basic email support for SMTP, POP3, and IMAP4
Easy management of Outlook and Exchange Server profiles across multiple machines to lower support costs