Microsoft says that users of the free Windows Live Mail 2012 on Windows 7 who have an Outlook.com account won't be able to send or receive emails from that app after June 30.
Microsoft explained what is going on in a blog post:
Microsoft says that Windows 7 users of Windows Live Mail 2012 will be able to use the included Mail app to keep getting their Outlook.com messages if they upgrade their OS to Windows 8.1 or Windows 10. If they don't want to upgrade just yet, they can still access their Outlook.com emails via a web browser in Windows 7. Microsoft will also provide those users a free one-year subscription to Office 365 Personal. It includes Outlook 2016, which can send and receive Outlook.com messages.
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