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For IMSS

Active Directory is not supported in IMSS 7.1 for Windows. Administrators may encounter issues when using the LDAP feature of IMSS for Domain Controllers on 2008.

However, IMSS 7.5 supports AD 2008. You may upgrade to IMSS 7.5 to meet your requirement.

For IMSVA

Active Directory 2008 is supported in IMSVA 8.2. If you are using Windows 2008 in your environment, upgrade to IMSVA 8.2.