Can NIW be filed from abroad?

[NIW_help]

Gurus,
I want to get your advice. Since I did not get any reply for my post here http://www.immigrationportal.com/showpost.php?p=1944673&postcount=4

, I am starting a new thread.
I am planning to go back to India (not so sure). However, I already applied under EB1-OR. since I may be leaving US, EB1-OR case can be considered abandoned because it is tied to the employer. Is it true?

I am also planning to apply under NIW (which I think may be worth) too as a back up. I Have the materials, but not yet applied.

If I apply and leave the country (assuming I am not coming back for few years), what are the chances of my case getting approved?
Once I leave US, is it considered I abandon the case?
What I will have to do for change of address?
Can a foreign address be used? or should I have to give one of my friend's address?

Can I-485 be filed from outside US? or should I have to do consular processing?
Being in a foreign country can I still justify my presence is important for NIW?
by the way I am from NSC area.
TIA for the help.

 

[nscagony]

EB1-OR is for future employment so as long your employer wants to keep hiring you upon approval its fine.

NIW can be filed from inside or outside the US as well.

I-485 is adjustment of status, so as the name suggest you must be in the US with proper non-immigrant status. CP is much faster anyway, so just do that.