A long time ago you could take the upgrade exams to move your MCSE 2000 to MCSE 2003 and then your MCSE 2003 into MCITP 2008. But I'm afraid the exams have been retired, so you are "stuck" with your MCSE 2000. If you want one of the latest certifications,
you will need to start from scratch.
You probably want to get one of the new MCSE certifications (which, by the way, now means "Microsoft Certified Solutions Expert", while the old MCSE was "Microsoft Certified Systems Engineer").
http://www.microsoft.com/learning/en-us/mcse-certification.aspx
Given your background, I believe that you would be interested in the "MCSE:Server Infrastructure". There is no "2014" in the MCSE. Instead of being tied to a specific version of the operating system, the new certifications expire and require you to recertify
periodically.
Take a look at the following page, which lists the five exams that you will need to pass:
http://www.microsoft.com/learning/en-us/mcse-server-infrastructure-certification.aspx
Note that five exams is less than the number of upgrade exams that you would need to take if it were still possible to take all the upgrades to move all the way from 2000 to 2012.
