As of this time Hotmail currently does not support Activesync so this option is currently not available. Hotmail is POP3 while Gmail is IMAP which allows the phone to synchronize off the server. As a workaround you can have gmail pull your hotmail into it, or you can have hotmail forward everything to your gmail account. The advantage to forwarding is it's faster, as you can't set the schedule for how often gmail checks your hotmail account. But as far as the calendar goes there is no way to get your hotmail calendar to sync unfortunately.