mixed mode
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Microsoft Exchange 2003
The default operating mode of Exchange when it is installed. Mixed mode allows Exchange 2003 and Exchange 2000 servers and servers running earlier versions of Exchange to coexist in the same organization. Mixed mode allows interoperability between versions by limiting functionality to features that are shared by both products. [Exchange 2003]
Technology› E-mail› Microsoft Email› Microsoft Exchange
Microsoft Exchange 2007
In a mixed mode organization, any combination of the following versions of Microsoft Exchange is deployed in a single Exchange organization: Exchange Server 4.0, Exchange Server 5.0, Exchange Server 5.5, Exchange 2000 Server, and Exchange Server 2003. By default, Exchange 2000 Server and Exchange Server 2003 are installed in mixed mode. Mixed mode exists to maintain backward compatibility. However, mixed mode limits the system to the constraints that are imposed by earlier releases of Microsoft Exchange. For example, in a mixed mode organization that contains Exchange 5.5 and Exchange 2003 servers, the rules that apply to Exchange 5.5 also apply to Exchange 2003. [Exchange 2007]
Technology› Operating System› Microsoft Windows› Microsoft Windows Server
Microsoft Active Directory
Allows domain controllers running both Windows 2000 and earlier versions of Windows NT to co-exist in the domain. In mixed mode, the domain features from previous versions of Windows NT Server are still enabled, while some Windows 2000 features are disabled. In mixed mode, the domain may have Windows NT 4.0 backup domain controllers present. Nested groups are not supported in mixed mode.