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OWA functionality with different web browsers

This table illustrates the OWA functionality available with different browsers.

OWA feature	IE6	IE5.01 -5.5	Others
Email, Calendar, and Task	Yes	Yes	Yes
New Outlook 2003 look-and-feel, including right-click functionality	Yes	Yes	No
Ability to mark an email as unread	Yes	Yes	No
Server-side spelling checker	Yes	Yes	No
Forms-based authentication (session timeout)	Yes	Yes	Yes
S/MIME support	Yes	No	No
Two-line view	Yes	Yes	No
Context menus	Yes	Yes	No
Improved keyboard shortcuts	Yes	Yes	No
Ability to forward meeting requests	Yes	Yes	Yes
Notifications on navigation pane	Yes	Yes	No
Add to contacts	Yes	Yes	No
Ability to pick names from address book	Yes	Yes	Yes
Ability to set maximum number of messages displayed in views	Yes	Yes	Yes
Options to mark as read when using Reading Pane	Yes	Yes	No
Public folders display in their own browser window	Yes	Yes	No
Message sensitivity settings on information bar	Yes	Yes	Yes
Attendee reminder option for meeting request	Yes	Yes	No
New calendar view to launch the calendar in its own window	Yes	Yes	Yes
User interface to set common server-side rules	Yes	Yes	No
Outlook 2003 style Quick Flags	Yes	Yes	No
Support for Tasks	Yes	Yes	Yes
Support for message signatures	Yes	Yes	Yes
Search folders	Yes	Yes	No
Attachment blocking	Yes	Yes	Yes
Web beacon blocking to make it more difficult for senders of spam to confirm email addresses	Yes	Yes	Yes
When a user clicks a hyperlink in the body of an email message, OWA helps protect private information from being revealed to the visited web site	Yes	Yes	Yes
GZip compression to increase performance and speed	Yes	No	Depends