Para obtener la certificación MCITP Server Administrator en Windows 2008 Server hay que aprobar 3 exámenes. Son los siguientes:

Examen 70-762:
Curso 6420: Fundamentals of a Windows Server 2008 Network Infrastructure.
Curso 6421: Configuring and Troubleshooting a Windows Sever 2008 Network Infrastructure.

Examen 70-640:
Curso 6424: Fundamentals Microsoft Windows Server 2008 Active Directory.
Curso 6425: Configuring and Troubleshooting Windows Server 2008 Active Directory Domain Services.
Curso 6426: Configuring Identity and Access Solutions with Windows Server 2008 Active Directory.

Examen 70-646:
Curso 6430: Administración y Mantenimiento de Windows 2008 Server.

Aquí te detallamos información del Examen 70-640 :

About this Exam
This Technology Specialist (TS) exam, Exam 70-640: TS: Windows Server 2008 Active Directory, Configuring, became available in March 2008. This exam is available in English, Brazilian Portuguese, Chinese, French, Japanese, Korean, Russian, and Spanish.
Audience Profile
The Microsoft Certified Technology Specialist (MCTS) on Windows Server 2008 credential is intended for IT professionals who work in the complex computing environment of medium-sized to large companies. The MCTS candidate should have a minimum of one year of experience implementing and administering a network operating system in an environment that has the following characteristics:
250 to 5,000 or more users
Three or more physical locations
Three or more domain controllers
Network services and resources such as messaging, a database, file and print, a proxy server, a firewall, the Internet, an intranet, remote access, and client computer management
Connectivity requirements, such as connecting branch offices and individual users in remote locations to the corporate network and connecting corporate networks to the Internet
Credit Toward Certification
When you pass Exam 70-640: TS: Windows Server 2008 Active Directory, Configuring, you complete the requirements for the following certification(s):
Microsoft Certified Technology Specialist (MCTS): Windows Server 2008 Active Directory, Configuration
Exam 70-640: TS: Windows Server 2008 Active Directory, Configuring: counts as credit toward the following certification(s):
Microsoft Certified IT Professional (MCITP): Enterprise Administrator
Microsoft Certified IT Professional (MCITP): Server Administrator

Opción 1:

MCSE en Windows Server 2003 a MCTS en Windows 2008:
MCTS: Windows Server 2008 Active Directory Configuration
MCTS: Windows Server 2008 Network Infrastructure Configuration
MCTS: Windows Server 2008 Applications Infrastructure Configuration
Examen 70-649: TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008

Opción 2:

MCSE en Windows Server 2003 a MCITP: Server Administrator Windows Server 2008
Examen 70-649: TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008
Examen 70-646: PRO: Windows Server 2008, Server Administrator

Opción 3:

MCSE on Windows Server 2003 a MCITP: Enterprise Administrator Windows Server 2008
Examen 70-649: TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008
Examen 70-647: PRO: Windows Server 2008, Enterprise Administrator
+ 1 examen a elegir entre:
Examen 70-680: TS: Windows 7, Configuring
Examen 70-620: TS: Configuring Microsoft Windows Vista Client
Examen 70-6241: TS: Deploying and Maintaining Windows Vista Client and 2007 Microsoft Office System Desktops

Opción 1:

MCTS: Windows Server 2008 Active Directory, Configuration
MCTS: Windows Server 2008 Network Infrastructure Configuration
Examen 70-648: TS: Upgrading Your MCSA on Windows Server 2003 to Windows Server 2008

Opción 2:

MCSA en Windows Server 2003 a MCITP Server Administrator 2008:
Examen 70-648: TS: Upgrading Your MCSA on Windows Server 2003 to Windows Server 2008
Examen 70-646: PRO: Windows Server 2008, Server Administrator

Opción 3:

MCSA en Windows Server 2003 a MCITP: Enterprise Administrator 2008 Server
Examen 70-648: TS: Upgrading Your MCSA on Windows Server 2003 to Windows Server 2008
Examen 70-643: TS: Windows Server 2008 Applications Infrastructure, Configuring
Examen 70-647: PRO: Windows Server 2008, Enterprise Administrator
+ otro examen a elegir entre:
Examen 70-680: TS: Windows 7, Configuring
Examen 70-620: TS: Configuring Microsoft Windows Vista Client
Examen 70-6241: TS: Deploying and Maintaining Windows Vista Client and 2007 Microsoft Office System Desktops

Guía del Examen Microsoft: 70-649:

Examen Microsoft 70-649:
Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008, Technology Specialist

Audience Profile
Exam 70-649 is intended for IT professionals who currently hold an MCSE on Windows Server 2003 certification and work in the complex computing environment of medium to large companies. The MCSE on Windows Server 2003 is a prerequisite for this exam. Without it, your transcript will show that you passed the exam but will not show credit for the resulting certifications.
You should have at least one year of experience implementing and administering a network operating system in an environment that has the following characteristics:
250 to 5,000 or more users
Three or more physical locations
Three or more domain controllers
Network services and resources such as messaging, a database, file and print, a proxy server, a firewall, the Internet, an intranet, remote access, and client computer management
Connectivity requirements such as connecting branch offices and individual users in remote locations to the corporate network and connecting corporate networks to the Internet

Credit Toward Certification
When you pass Exam 70-649: TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008, Technology Specialist, you complete the requirements for the following certification(s):
Microsoft Certified Technology Specialist (MCTS): Windows Server 2008 Active Directory Configuration
Microsoft Certified Technology Specialist (MCTS): Windows Server 2008 Network Infrastructure Configuration
Microsoft Certified Technology Specialist (MCTS): Windows Server 2008 Application Platform Configuration

Exam 70-649: TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008, Technology Specialist: counts as credit toward the following certification(s):
MCITP: Server Administrator
MCITP: Enterprise Administrator

Fuente: Microsoft

Guía del examen Microsoft 70-648 :

Examen 70-648:
Upgrading from Windows Server 2003 MCSA to, Windows Server 2008, Technology Specializations

About this Exam
Exam 70-648 is an upgrade exam that is a composite of two stand-alone exams: 70-640 and 70-642. Exam 70-648 validates skills related to the core technology features and functionality of Windows Server 2008, from the existing knowledge base of a Microsoft Certified Systems Administrator (MCSA) on Windows Server 2003.

Exam Topics Covered
Exam 70-648 is an upgrade exam that is a composite of two stand-alone exams: 70-640 and 70-642. Exam 70-648 validates skills related to the core technology features and functionality of Windows Server 2008, from the existing knowledge base of a Microsoft Certified Systems Administrator (MCSA) on Windows Server 2003.
Exam 70-640: TS: Windows Server 2008 Active Directory, Configuring
Configuring Additional Active Directory Server Roles (11 percent)
Maintaining the Active Directory Environment (15 percent)
Configuring Active Directory Certificate Services (14 percent)
Exam 70-642: TS: Windows Server 2008 Network Infrastructure, Configuring
Configuring IP Addressing and Services (24 percent)
Configuring Network Access (22 percent)
Monitoring and Managing a Network Infrastructure (14 percent)

Audience Profile
Exam 70-648 is intended for IT professionals who currently hold an MCSA on Windows Server 2003 certification and work in the complex computing environment of mid-sized to large companies. The MCSA on Windows Server 2003 certification is a prerequisite for this exam. Without it, your transcript will show that you passed the exam but will not show credit for the resulting certifications.

Fuente: Microsoft

Si deseas realizar el Examen de Microsoft 70-652 y 70-654 y estar certificado en Virtualización de Hyper-V aquí tienes la ruta de certificación:

Virtualización en servidor sobre Hyper-V

70-652 – TS: Windows Server 2008 Virtualization, Configuring
Course 6411: First Look: Getting Started with Windows Server 2008 Hyper-V Hands-On Lab

70-643 – TS: Windows Server 2008 Applications Infrastructure, Configuring
Course 6418: Deploying Windows Server 2008
Course 6427: Configuring and Troubleshooting Internet Information Services in Windows Server 2008
Course 6428: Configuring and Troubleshooting Windows Server 2008 Terminal Services

Puedes encontrar más información del 70-652

Puedes encontrar más información del 70-643

Virtualización de presentaciones sobre Terminal Services

70-643 – TS: Windows Server 2008 Applications Infrastructure, Configuring
Course 6418: Deploying Windows Server 2008
Course 6427: Configuring and Troubleshooting Internet Information Services in Windows Server 2008
Course 6428: Configuring and Troubleshooting Windows Server 2008 Terminal Services

Puedes encontar más información del 70-643

A continuación te detallamos las rutas de certificación de diferentes certificaciones de Microsoft:

MCITP Windows 2008 Server
MCSE Windows 2003 Server
MCTS Exchange Server 2007
MCPD SQL Server 2008
MCPD Visual Studio.Net

Puedes encontrarlas en este enlace

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Puedes encontrar más información en este enlace