Short answer: You can’t.
There is a range of breaking protocol changes between the December bits and the March bits. Your app won’t work until you upgrade (uninstall/install) to the March 2009 CTP client bits and/or SDK.
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Weblog / 2009
How do I use the .NET Services “December 2008” CTP SDK with the “March 2009” CTP Services?
Short answer: You can’t. There is a range of breaking protocol changes between the December bits and the March bits. Your app won’t work until you upgrade (uninstall/install) to the March 2009 CTP client bits and/or SDK.
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