While Apple users don't typically use Windows devices, those users who do will get the option to use iMessage right from their PCs. But it'll be on a limited capacity, of course. A preview of this new feature is available to Windows Insiders now. You can use the Microsoft Phone Link app to send and receive messages through iMessage, make or receive calls, and see your notifications.
Microsoft uses Bluetooth to link Windows devices to iPhones. As mentioned, there are limitations., including the inability to send pictures or join group messages. You won't be able to view the full message history, either. Only the messages sent or received through Phone Link will be visible. It might seem like the feature is too rudimentary, but this is the first time Microsoft supports calls and messages from iPhones, making it a step in the right direction. Microsoft has started testing the feature out with a small group of users, but it plans to increase this number over time.