When applying for a job and one’s employer doesn’t know that one is applying for any job, is or ain’t it appropriate to send the letter of interest on the company’s/entity’s letterhead? The letterhead names who’s on the entity’s board, if that matters.
Also, what exactly is the diff between a letter of interest and a letter of introduction anymore, anyway?
It is never appropriate to use your current employer’s letterhead to do any personal business. This definitely includes applying for a job at another company. I am, frankly, astonished that one might be possessed of any other notion.
Letters of interest are written by oneself; letters of introduction are written by third parties, if one is an ambassador, and not at all otherwise.
It should take less than five minutes to create your own personal letterhead using Word on a rented computer at The-Establishment-Formerly-Known-As-Kinko’s. Otherwise, you are almost certainly going to alienate both your nearly former employer, and you’re showing poor judgment to any potential future employer.
I’m curious what your friend wants accomplish by using the letterhead. If he wants to document his employment he should send his resume. If he wants to look professional, creating his own letterhead or using good paper and professional business letter format will do that.