Feature Description OWA for IE 5.x/6.x (PC) Basic OWA
Logon page New custom form for logging on to OWA using a front-end server; includes cookie-based validation where OWA cookie is invalid after user logs out or is inactive for predefined amount time Yes, with choice of using Internet Explorer or basic OWA Yes, but allows only use of basic OWA
Clear credentials cache on logout After logout, clears credential cache automatically Yes, in Internet Explorer 6 SP1 No
Two-line mail view New view orients message list vertically instead of horizontally; works well with Preview Pane on right Yes No
Preview Pane Preview Pane can now appear to the right of messages; you can open attachments within the pane Yes No
Mark as read/unread Command enables users to mark unread messages as read or vice versa Yes No
Quick Flagging Command enables users to assign follow-up flag to messages Yes No
Keyboard shortcuts Common actions such as new message, mark as read/unread, reply, and forward are available when focus is in message list Yes No
New navigation pane Unified user interface contains module shortcuts, full folder tree, and customizable width Yes No
Spell check Spell check is provided for e-mail messages Yes No
Add to Contacts Users can add resolved recipients in received mail or drafts to main Contacts folder Yes, feature in Properties sheets No
"Spam Beacon" blocking Users can control options for blocking external content in e-mail Yes Yes
Attachment blocking Administrator options restrict access to some or all attachments in messages Yes Yes
Encrypted/signed mail Sending and receiving encrypted and/or signed e-mail is supported Yes, Internet Explorer 6 on Windows 2000 or Windows XP only No
Rules Users can create and manage server-based e-mail-handling rules Yes No
Personal tasks Users can create and manage personal tasks Yes Yes, but no Reminders
Bytes over the wire Fewer bytes sent over the wire from server to browser Yes Yes

Table 1 Get the New Features. Outlook Web Access (OWA) in Exchange Server 2003 offers a wide range of new features, and provides a user experience much closer to Outlook than previous versions. You can choose from two versions, and the features users get depends on the version you choose.