Now I am still working with Office 365. I am still try to test all the features and also the support for mobile devices like the iPhone or Windows Phone 7. As a Windows Phone 7 developer I could get the beta for the next update of Windows Phone 7 called Mango. Now Mango will support Office 365. You can simply add your Office 365 account on your phone and this will connect you to Exchange Online and SharePoint Online.
What is missing in first beta of the Windows Phone 7 Mango update is Lync, but Microsoft is working on that.