When should I apply for H1B?

You seem to have choices. If USCIS determines that they have not received over 20,000 Master's cases or cap cases, your employer can still file. ...

I was denied a B2 visa this month but was wondering if my circumstances changed enough to apply for an F1 Visa.

If B-2 was denied due to strong ties to home country issue, F-1 is likely to get denied for the same reason unless there has been a change in...

L1 and I94 expires on July 2013. My wife I94 is valid till jan 2016. Can she stay in US even if my L1 extension gets rejected?

Your wife's L-2 status is dependent on you irrespective of her I-94 expiration date. If the L-1 extension gets denied and you have no status after...

Switching to an F1 while on an F1(OPT), with a pending H1B visa petition

Did the company apply for change of status?

The original approval notice is a company document and they are to retain it. You cannot file for the duplicate. You are entitled to your...

H1B transfer with cancelled approved notice

Withdrawal notice by Employer A will not impact H-1B petition filed by your new employer if you are not in the U.S.

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Can I become an employee of non-e-verified company if H-1B visa is filed but I am working on OPT extension?

If the OPT will be extended you continue to work for e-verified company until the H-1B approval start date with your new employer.

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Do I need New LCA before filing for visa amendment or first file for amendment and then file for new LCA?

Let your employer worry about this.

I797 revalidation or extension

Depends on the last date of employment.

H1b Petition courier marked "Attn: I-129"

It is not likely to be rejected right way but there may be a confusion as to whether it will be counted towards the quota