Outlook - technical definition

Microsoft's mail client and personal information manager. Outlook Express is a lite version for e-mail only that comes with Windows. The full version includes a PIM, calendaring, to-do list and groupware functions. It also provides a journaling capability for keeping track of hourly billing. Outlook can be used as the client end to Microsoft's Exchange Server or as the e-mail client with any ISP account.

Outlook Web Access (OWA)
Formerly called "Exchange Web Connect" (EWC), Outlook Web Access (OWA) is provided by Exchange Server and enables users on the road to access their e-mail, contacts and calendar from any Web browser without having to run a pre-configured Outlook client program. See Microsoft Office, Microsoft Exchange and Windows Live Mail.