Microsoft Outlook

Overview

Outlook was first released by Microsoft in 1997 as part of the Office 97 suite, evolving out of the earlier Microsoft Schedule Plus calendaring application. It became the default email and calendaring client bundled with Microsoft Office, and later Microsoft 365, and its use of the proprietary Exchange/MAPI protocols made it the standard client for organizations running Microsoft Exchange Server.

In 2020, Microsoft began rolling out a new web-technology-based version of Outlook for Windows and Mac (often called the “new Outlook”), built on the same codebase as Outlook on the web, gradually replacing the older native Win32 client. Outlook remains tightly integrated with Microsoft 365 services including Exchange Online, Teams, and OneDrive.

Key Features

• Unified inbox — Email, calendar, contacts, and tasks in a single application
• Exchange/Microsoft 365 integration — Deep integration with Exchange Online mailboxes, shared calendars, and Microsoft 365 apps
• Focused Inbox — Automatic sorting of priority email from lower-priority messages
• Rules and quick steps — Automated email filtering, forwarding, and multi-action shortcuts
• Scheduling assistant — Meeting scheduling with free/busy visibility across an organization
• Cross-platform sync — Consistent mailbox state across Windows, macOS, web, iOS, and Android clients

Use Cases

• Corporate email and calendaring — Standard client for organizations on Microsoft 365 or Exchange Server
• Meeting scheduling — Coordinating meetings across teams using shared calendar availability
• Task and contact management — Centralizing to-do lists and contact directories alongside email
• Cross-device access — Consistent access to mail and calendar from desktop and mobile

Who It’s For

Outlook is aimed at businesses and organizations already invested in the Microsoft 365 ecosystem who need tight integration between email, calendaring, and other Microsoft services. Its licensing is bundled with Microsoft 365 subscriptions, making it primarily relevant to users who already have — or are considering — an Office subscription rather than a standalone email client purchase.