Thank you for writing. You can export ICal format file and import it in the MSExchange. Or, you can write your own export to create a file in a specific format that you prefer. You can find the necessary documentation here
As to your last question, you can't use the ASP.NET AJAX Exchange Provider in the WinForms RadScheduler.
the Telerik team
Q3’10 SP1 of RadControls for WinForms is available for download
; also available is the Q1'11 Roadmap
for Telerik Windows Forms controls.