need urgent help ... L1A to H1

[shrudhi12]

I work for company A. I got my L1A stamped in chennai(India) through company A and it was valid from 12July2005 to 01July2008 (just got the extension approved till 29APR2010). I travelled first time with this L1A visa on 11Dec2005 from india to USA.
I stayed in Texas until 01Nov2006 and moved back to India. In parallel during the year 2006, I got my H1B processed by different employer (say B) and got approved. Approved H1B was valid from 01Oct2006 to 30Sept2009. This H1B was with "change of status". I did not use this H1B at all. From India I travelled back to USA on 18FEB07 with employer A with my old L1A. Till now I am working with employer A with the same L1A.
My question, is there a possibility of me joining employer B now with the H1B which I got earlier? Kindly let me know as this drives major decisions in my career.

Thanks a lot for your help, really appreciate it.

[txh1b]

That H1b can be used for your next H1b job for getting a new H1b without being subject to cap. However, you had 1 month of unauthorized/illegal work during your past stay from Oct 1st through Nov.

Once a COS to H1b is approved, you should not work on L1.