Internet Mail Only (aka IMO mode): A lighter application mode with specific emphasis on POP3 and IMAP accounts, including a lightweight Fax application.

Outlook 98 and Outlook 2000 offer two configurations:

Outlook has replaced Microsoft's previous scheduling and email clients, Schedule+ and Exchange Client. Outlook on the web (previously called Exchange Web Connect, Outlook Web Access, and Outlook Web App) is a web business version of Microsoft Outlook, and is included in Office 365, Exchange Server, and Exchange Online. Originally known as Hotmail, it was rebranded as in 2012. is a free webmail version of Microsoft Outlook, using a similar user interface.

Apps of Outlook for mobile platforms are also offered. Individuals can use Outlook as a stand-alone application organizations can deploy it as multi-user software (through Microsoft Exchange Server or SharePoint) for such shared functions as mailboxes, calendars, folders, data aggregation (i.e., SharePoint lists), and appointment scheduling. Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging and web browsing, and has also become a popular email client for many businesses. Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office and Microsoft 365 software suites.

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