The vector stencils library "Microsoft Exchange" contains 17 symbols of Microsoft Exchange elements for drawing the logical structure diagrams of Active Directory trees.
"Microsoft Exchange Server is calendaring software, a mail server and contact manager developed by Microsoft. It is a server program that runs on Windows Server and is part of the Microsoft Servers line of products." [Microsoft Exchange Server. Wikipedia]
The shapes example "Design elements - Microsoft Exchange" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Active Directory Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.