Important: Microsoft removed the ability to add new accounts to Outlook on the web using the Connected accounts feature in September 2018.
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You can't connect new accounts after September 15, 2018.
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Accounts that were connected before September 15, 2018, continued to sync as usual until October 30, 2018.
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After October 30, 2018, all connected accounts stopped syncing email.
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On November 15, 2018, the Connected accounts option (Settings > Mail > Accounts) will be removed from Outlook on the web.
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Email that has already synced will continue to appear in your inbox unless you remove it manually.
Notes: To continue seeing email from other accounts:
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Forward email from those accounts to Outlook on the web. For more information, see Turn on or off automatic forwarding in Outlook.com, Automatically forward Gmail messages to another account, and Automatic email forwarding in Yahoo Mail.
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Connect your other account to Outlook for Windows or Outlook for Mac (see Add an email account to Outlook).
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Download Outlook for iOS or Outlook for Android, which lets you sync your email, calendar, and contacts with other email accounts, easily switch between accounts, and offers a combined inbox, search, and an integrated calendar experience. For more information about how to set up Outlook mobile on your phone, see Outlook for iOS and Android Help Center.