I often use "OK" in business and personal emails and phone conversations. But I often feel uncertain if it is appropriate to use it in every type of context.
Please tell how universally I can use this word (if it can be called "word") without annoying native English speakers?
Best Answer
It's ok to use it in pretty much any email and (especially) phone conversation, even in business context. At least that's my experience from the software industry (communicating mostly with European and North American people). For formal letters and academic writing it would be a different story, of course.
But if you don't want to annoy people, please do not always write it in capital letters ("OK"), ok? :-) Maybe it's just me, but that seems somewhat archaic.