Hi Stuart,
To upgrade youe MSDBA to MCITP SQL 2005 you will need to complete 2 exams, these are 70-431 and 70-447.
This is outlined here:
http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-447 on the Upgrade exam.
After completing this you can then do 70-453 to update and gain MCITP SQL 2008. Information on the 2005 to 2008 upgrade is here:
http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-453
So there will be 3 exams in total.
The other option is to go straight for SQL 2008 with exams 70-432 and 70-450, this way you will only be sitting 2 exams.
Although you will not be certified in SQL 2005 this way, it is best to hold the latest certification for the subject.
Information about this is here:
http://www.microsoft.com/learning/en/us/certification/mcitp.aspx#tab2
Hope this helps, best of luck with your exams.
Jarad, MCITP, Brisbane Australia
