Approved H1b Petition I-797C(Unstamped & Expired) - Eligibility for Cap-Exempt?

[rthogiti]

Hi All,
One of the Employer sponsored H1B in Apr-2008, It got approved and have valid I-797C Notice of Action from the employer. Due to some personal constraints,
I have not attended the consulate interview at that moment and have not taken up the interview yet, also didn't entered US till now.

My Question is,
1. Can I use the same approved petition(I-797C, Notice of Action) to process with another employer who can do the exchange/transfer Process of my petition.
2. Will it accepts USCIS in Out of Cap-Exempt and do the process(more than 6yrs now), Can I approach new employer now.

Please let me know how to proceed further to get it valid.

Thanks,
Ram