Business Central requires that you use a work, or school, email address to sign up. Business Central does not support email addresses provided by consumer email services or telecommunication providers. This includes outlook.com, hotmail.com, gmail.com, and others.
If you try to sign up with a personal email address, you will get a message indicating to use a work or school email address.
Business Central online is fully integrated with Microsoft 365 so that you can navigate freely between Microsoft 365 apps and Business Central using the app launcher. In Business Central, you can open data in Excel, print reports using Word, and you can work with your Business Central data in Outlook, for example.