Microsoft outlook 2002 is the upgrade to Microsoft Outlook 2000 and includes the below new features.

Outlook Hotmail support
Auto complete addressing
Intuitive management of e-mail, contacts and appointments
Smart tags in Word mail

Overall, users who are utilizing Microsoft Outlook 2000 would most likely not find it necessary to upgrade to Microsoft Outlook 2002 unless they believe the above features will be useful.


Microsoft Outlook 2000 is an advanced e-mail software program that allows users to send and receive e-mail. In addition to e-mail, Outlook has a personal calendar and group scheduling, personal contacts, personal tasks and the ability to collaborate and schedule with other users.

About Outlook Express

Outlook express is a slimmed down version of the Microsoft Outlook software family. Outlook express is included with Microsoft Internet Explorer and also with Microsoft Windows 98 and above.
System Requirement for Outlook 2002
Computer: 100% IBM Compatible
Processor: Intel Pentium 133MHz or higher]
Memory: 24MB RAM for Windows 98 32MB RAM for Windows NT / ME 64MB RAM for Windows 2000
Drives: 135-190MB Hard disk drive space 2x CD-ROM
Sound: Multimedia computer required for sound and other multimedia effects.
Video: VGA or higher-resolution
Controls: Keyboard / Mouse
Operating System: Microsoft Windows 98 / NT 4.0 with Service Pack 3 / 2000
Other: Requires Internet and/or Network access with SMTP/POP3, IMAP4 or other MAPI compliant messaging service
System Requirement for Outlook 2000
Computer: 100% IBM Compatible
Processor: Intel Pentium 75MHz or higher
Memory: 16MB RAM for Windows 9x32MB RAM for Windows NT4.0
Drives: 178MB Hard disk drive space 2x CD-ROM
Sound: Multimedia computer required for sound and other multimedia effects.
Video: VGA or higher-resolution
Controls: Keyboard / Mouse
Operating System: Microsoft Windows 95 / 98 / NT 4.0 with Service Pack 3
Other: Requires Internet and/or Network access with SMTP/POP3, IMAP4 or other MAPI compliant messaging service

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Outlook Information, Outlook Help, Outlook Support

source: microsoft.office.com