Active Directory Users and Computers MMC snap-in incorrectly displays Serbia and Montenegro as one country in Windows Server 2008 and in Windows Vista
In Windows Server 2008 and in Windows Vista, Serbia and Montenegro are displayed as Serbia and Montenegro (former) in the Country/region list of the Active Directory Users and Computers Microsoft Management Console (MMC) snap-in. However, Serbia and Montenegro are now two separate countries.
Note: The two countries must be listed separately to comply with ISO-3166.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2512366.