which components are not available in changesets?

Hello Uday,

The components available for a change set vary by edition.
have a look on the below link

https://help.salesforce.com/HTViewHelpDoc?id=changesets_about_components.htm&language=en_US (https://help.salesforce.com/HTViewHelpDoc?id=changesets_about_components.htm&language=en_US)

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