I n broad terms, it mans that you agree because of some reason that has been given. It's not inherently offensive, but only say it if you have a friendly and very casual relationship with your boss. e mailing, not mailing.
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you see, it depends on how you use it. if you use it a conversation and youuu look annyoed than that can be taken offensivly. if youu are eamiling someone than like [a boss} he wont take it o
When using abbreviation for the word, shouldn't both the letters 'o' and 'k' be capitalised?