https://www.theguardian.com/technology/askjack/2018/jul/12/can-i-add-an-iphone-and-chromebook-to-my-all-microsoft-system

If Paul adds an iPhone and Chromebook to his Microsoft devices, will it lead to a mess of email addresses and accounts?

Over the past few years I have been using all Microsoft-oriented products: a Windows 10 laptop and desktop, a Windows phone (Lumia 950) and a Surface 2 (Windows RT) tablet. One advantage is that they all log on to a single Windows account with an Outlook email address. I use Outlook (from Office 365) to manage my email, contacts and calendar.