Microsoft has rolled out an update that will allow Hotmail users to receive push email, calendar appointments, and contact updates on mobile devices. That means changes you make on your mobile device will be reflected on the web, or vice versa. You can delete an email, add a contact, or make other changes and they should appear on all of your synchronized devices almost right away.
You’ll need a device that supports Exchange ActiveSync, which right now means a device running Windows Mobile 6 and up, an iPhone, iPod touch, or iPad, or Nokia E-Series, S-Series, or N-series phone.
Google Android isn’t officially supported, but some users apparently report that they’ve been able to set up Hotmail syncing on Android 2.2.
You can find detailed instructions for configuring your device at the Windows Live Solution Center.