What do I do when I see someone using my company name?

Do you have a trade name? You need to give more details and to consult with a business attorney in New York.

I am a 50 %owner of s S-corp. My parnter decided he wants out .. how do i know what to "buy himout for" thats fair ?

An accountant will be able to give you the fair market value.

Is a shareholder in a corporation "s", aloud to change bank account and corporate name without telling the other shareholder, t

They might be able to do so depending on what is mentioned in the corporate documentation and in the shareholders' agreement, if any. You need to...

When starting an online servicing business, what legal hoops do I need to jump through to ensure I won't get in trouble?

Regarding internet services, a well drafted terms and conditions of use is essential! Do not get in trouble. Hiring a business attorney in New York...

I was told the stature of limitations law in New York is three years is this true?

If this is a contract related question, it is 6 years. However, you should provide more facts if you want a more accurate answer.

Can I use the same company name as a business in Europe?

If your goal is to save money, then... change the name. However, hiring a business lawyer shall be seen as an investment!

Personal backing a corporate account.

This does not sound right. You will be personally liable.

Possible if the LLC has elected Sub "S" status.

Can two companies who are in different industries and different states have the same name?

Always check on the department of State business name search tool and try to avoid confusion. Otherwise there is always a risk of litigation.

Can I sue this company using my name in another state?

You need to think first how this impacts your business? Did you suffer any loss/damages??