Using New Outlook on Windows for professional communication and productivity
Microsoft 365 Business Basic still includes the Exchange Online mailbox and Outlook on the web/mobile, but it does not include the license required to use that work account by itself in new or classic Outlook for Windows.^1^
The message in the screenshot is therefore a licensing restriction, not an indication that the mailbox or paid email service has been removed. Microsoft documents this account-not-supported error for subscriptions that do not include Outlook desktop-app rights.^2^
Available options
- Keep Business Basic and use Outlook on the web or mobile.
Business Basic includes the web and mobile versions of Outlook. Open Outlook on the web through Microsoft 365 in a browser and sign in with the Business Basic work account. - Upgrade the user to Business Standard or Business Premium.
Both include the desktop Microsoft 365 applications, including Outlook. Microsoft 365 Apps for business is also listed as carrying desktop-app rights, although mailbox licensing must still be maintained separately.^1^ - Use another qualifying Microsoft 365 subscription already owned.
If new Outlook contains any account licensed for desktop applications—such as Microsoft 365 Personal/Family, Business Standard, or Business Premium—the Business Basic mailbox can then be added as a secondary account.^1^ In new Outlook:- Select Add subscription and sign in with the account that owns the qualifying subscription.
- Open View → View settings → Accounts → Your accounts.
- Select Add Account and add the Business Basic email address.^3^
About switching back to classic Outlook
New Outlook may offer Help → Go to classic Outlook or a toggle for switching back.^4^ However, switching clients does not by itself add desktop-app rights. Classic Outlook also requires a qualifying desktop license when used with a Microsoft 365 organizational mailbox.^1^
If the account previously worked in desktop Outlook, check which subscription was activating that installation. It may have been a separate Personal/Family, Business Standard/Premium, enterprise, or perpetual Outlook license rather than Business Basic itself.
References