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The files are located in the \amd64\Setup\Data\ directory in the Exchange installation files. Each release includes all of the changes included in previous releases.
This means that if you skip a release, you may still need to apply schema updates even if the release you're installing doesn't include its own changes.
The following table gives examples of when your Active Directory will be updated, and when it's already up-to-date.
The Active Directory schema changes identified in this topic may not apply to all editions of an Exchange Server version.
By using the Offline Address Book, Outlook does not have to connect to Exchange in order to resolve names or open the records for each user.