Meta is shutting down its Messenger app for macOS and Windows and pushing users to the web. Meta confirmed over email to Engadget that the app will be fully shutdown on December 15, after which the easiest ways to access Messenger chats when you're not on your phone will be the Facebook app on Windows, or the Facebook and Messenger websites.The company hasn't provided an explanation for why it's abandoning its desktop Messenger apps, but Meta's support article does say that users will receive a notification informing them of the shutdown, and will be blocked from accessing the app after December 15.In order for your chats to be saved going forward, the company says you'll have to turn on secure storage and add a pin code to your account. To make sure your chats will be archived: