difference between outlook express and Microsoft outlook

How to Decide Which Client Best Suits Your Needs

When choosing between Outlook Express and Outlook, users and organizations should base their usage decision on the following criteria:

Outlook Express

Choose Outlook Express if:
You require only Internet e-mail and newsgroup functionality (for versions of Windows later than Microsoft Windows 95, versions of Windows earlier than Microsoft Windows 95, Macintosh, and UNIX platforms).
You use or plan to use Office 98 for Macintosh, and you want to take advantage of the integration of Outlook Express with this version of the Office suite.

Outlook

Choose Outlook if:
You require advanced Internet standards-based e-mail and discussion group functionality.
You require integrated personal calendars, group scheduling, task, and contact management.
You require integrated e-mail and calendaring, cross-platform clients for versions of Windows later than Microsoft Windows 95, versions of Windows earlier than Microsoft Windows 95, and Macintosh platforms.
You use, or plan to use Office 97, Office 2000, Office XP or Exchange Server and want to take advantage of the integration of Outlook with this version of the Office suite, and the integration with Exchange Server.
You require robust, integrated run-time and design-time collaboration capabilities