Project Thor is an open source project undertaken by the Minneapolis Cloud Computing User Group, led by Adam Grocholski from RBA consulting. Thor focuses on leveraging the power of Microsoft Tag, Windows Azure, and Exchange Server to allow access to the schedules and scheduling services of Exchange on most mobile devices! Thor is designed to be a real solution that showcases the power of cloud-based solutions coupled with on-premise software. Thor is implemented as an Azure-based solution, so you’ll need an Azure account to try it out. (If you really want to use it on-premise, the source code is provided). Thor ships with three different providers: Exchange 2010 Interop, and Exchange 2007 Interop(which use the Exchange Web Services Managed API), and Native Web Services (which uses the EWS autogenerated proxies).
Download: Thor (CodePlex)