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You create Active Directory Domain Services (AD DS) in Windows Server 2008. Then, you notice that the credential roaming schema differs from the credential roaming schema in Windows Server 2003.
This behavior occurs because the value of the isSingleValued property of the ms-PKI-RoamingTimeStamp attribute is changed to "True" in Windows Server 2008. However, the value of the isSingleValued property is "False" in Windows Server 2003.
This behavior is by design.
In Windows Server 2003, the credential roaming schema is updated. One of the updates is to include the ms-PKI-RoamingTimeStamp attribute. This attribute is a multivalued attribute. However, this attribute is only used as a single value attribute in Windows Server 2008.
For more information about the credential roaming schema changes in Windows Server 2003, visit the following Microsoft TechNet Web site: