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William Cheung About the compatibility between Salesforce Edition and Webservice API
Force.com Web Service API Developer's Guide
To use the API, your organization must use Enterprise Edition, Unlimited Edition, or Developer Edition. If you are an
existing Salesforce.com customer and want to upgrade to either Enterprise or Unlimited Edition, contact your account
representative.
I trial a Salesforce Professional Edition. Some apps I can integrated but others can not. If I want to develop an App that can be used in all editions of Salesforces, what api should I use and how should I with it?
Anyone let me know this.
It is the type of the editions that control if they support API access. For example, Professional doesn't support API access.
Professional doesn't support API access. However, how could develop an app to support all edtions of salesforce?
This wiki page might help you. http://wiki.developerforce.com/page/Designing_an_Application_for_Group_and_Professional_Edition