I wouldn't bother. You will just get sucked into a vicious circle of re-qualifying every product upgrade and chances are that you will get no extra money anyway. Remember, you only rent M$ certification. I would go for something more permanent like these...
http://www.lancaster.ac.uk/ictfocus/certs.html
I have 2 of these and damm nice they are too, platform free, a recognised certification, and cheaper than M$ when everything is factored in.
I agree with you Dos_box but it is pretty disheartening to find that pretty much every support job advertised in Lancashire (other than for a trainee or junior position) wants you to hold a Microsoft certification. Very frustrating!
Pete