If like me your are interested in Azure and want to use Visual Studio 2010, then you probably:
And then tried to create a new Cloud Service and got this error: “Method not found: ‘System.Collections.Generic.IEnumberable’1”
No need to panic. Notice there are two project types – Cloud Service and Cloud.
Click on Cloud and notice that there is another step to do – Enable Windows Azure Tools.

Click on Enable Windows Azure Tools:
Click on Download Windows Azure Tools:
Click on the the February 2010 release link:
Click on Download:
And hey presto… everything should now work just fine for you.
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