Microsoft Outlook supports multiple account types such as Microsoft Exchange Server, POP3, IMAP, and Outlook.com (formerly Hotmail).
Some features in Outlook require an Exchange account, which is provided by your organization, Microsoft 365, and some Internet hosting providers.
Check your account type in Outlook
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In the main Outlook window, choose File > Account Settings > Account Settings.
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On the Email tab, you'll see your accounts and the Type for each.
An Exchange account is listed as Microsoft Exchange.
Exchange version specific features
Some Outlook features require specific versions of Exchange. If you are using an Exchange account, see Determine the version of Microsoft Exchange Server my account connects to.
