I have Microsoft MCITP Certifications and would like to upgrade them to new MCSE: Server Infrastructure Certifications.
Since I have both MCITP: Server/Enterprise Administrator Certs, I can follow the upgrade tracks either cases as below.
Also, Microsoft provides more information about certification on below sites.
Born to Learn | Helping You Master Microsoft Technologies
This is the Blog site from Microsoft| Learning, and they provide a lot of good resources.
Microsoft Systems Engineer 