Outlook is an E-mail software program by Microsoft that enables users to send and receive e-mail on their computer. There are two versions of Outlook; Microsoft Outlook Express and Microsoft Outlook.
Microsoft Outlook Express is a slimmed down version of the Microsoft Outlook software family and was first included with Windows 98 and included with all versions of Windows up to Windows XP. With the introduction of Windows Vista, Microsoft introduced Windows Mail.
Microsoft Outlook is a commercial product available in a stand-alone version or part of the Microsoft Office package. This program is a much more full program with better corporate support and additional features not found in the free edition. Below is an example of Microsoft Outlook.