Hotmail has been on a roll this summer releasing updates for their current 350+ million users. Some of the updates included push mail, contact & calendar in Exchange ActiveSync, shipping tracking, Facebook Chat, attachment upgrades, more video support, subfolders, and security improvements.
Starting this week, Hotmail will begin rolling out another update that allows users to use any existing email address (non-hotmail and live) accounts on Hotmail. The update will take some time, as other Hotmail updates do, but once the rollout is complete, users will be able to send up to 10GB of photos in one message, use Messenger inside your inbox, and many other great Windows Live Hotmail features.
To get started, make sure you marry your existing email account to a Windows Live ID. Once you have confirmed your Windows Live ID account, login to Windows Live Hotmail and follow the activation steps.
As previously mentioned, the roll out is still taking place and may take some time to reach every customer, but once it does, you"ll be prompted with the activation steps. For now, some users may see this warning when trying to activate their email: