Is a browser based-client included with Exchange Server and Exchange Online (full name: Outlook Web App); renamed Outlook on the Web; see Outlook client.

Is a browser based-client included with Exchange Server and Exchange Online. Renamed Outlook on the Web; see Outlook client.

Is a browser based-client included with Exchange Server and Exchange Online.Formerly Outlook Web App; see Outlook client.

Client applications for accessing Exchange Online and Exchange Server and other systems for e-mail, contacts, calendars, tasks, and voicemail; most commonly licensed as part of various Microsoft 365 Enterprise and Office 365 Enterprise suites.

Is a Windows desktop application commonly used with Exchange Server and Exchange Online.See Outlook client.