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Using API 2.0 with Professional Edition?
I signed up and pay for a Professional Edition. I also setup a Developers Edition to test the use of the API with Java. Can I use the API 2.0 against my Professional Edition login?
If not why?
API access is one of the key distinguishing features of Enterprise Edition.
If you wish to create a composite application (using salesforce.com and custom code) you will need to use Enterprise Edition.
The differences between Professional Edition and Enterprise Edition are available online.