I have a tourist visa to the US which expires in 2009. However, back in 2004, i was able to obtain a F-1 visa for MBA studies. It expired in 2006 and my stay was extended through practical training. I have all necessary documents supporting that. My question is, will I still be able to use my tourist visa until the March 2009 expiration?
My assumption is that you are still on F-1 and in USA. If this is correct, you cannot use your B visa within USA.
While in USA, your stay and status is controlled exclusively by your I-94.
You can, however, try to reenter USA on B visa but after having stayed here for so long, a reentry is likely to be denied.
If, you are outside USA and have been out for a while (like a year or more), I think you can still use that B visa and try to enter USA.