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Matroskin Kot, thank you for the explanation, maybe you are right. I’ve never thought about this in such an aspect, I always thank in advance, even in Russian :oops: , and I don’t mean to be...

Thank you very much! It was really helpful. Special thanks to rockzmom for the detailed answer.

Why shouldn’t I use it in a formal business letter? Is it colloquial? What should be used instead?

Hi all!
The question is mainly to the native speakers. When writing a business letter to a person to whom I’m not introduced, is it necessary or acceptable (is it correct) to start with: How do you...