I'm unsure about the "agenda."
by R. Proffitt - 4/23/13 3:59 PM
In Reply to: synchronization contacts and agenda WINDOWSLIVE with GMAIL by pablodies
For over a decade MSFT has been very clear they want to sell Exchange Server when it comes to calendar functions. And now I see them pushing outlook.com for when they can't see Exchange.
So, as it stands I don't think this is supported without Exchange or you moving to outlook.com.