A polite New Year's greeting meaning 'Happy New Year', commonly used at the start of the year, especially in formal or business settings.
年始のメールの冒頭で『新年明けましておめでとうございます。昨年はお世話になりました。』と書いた。
At the start of my New Year's email I wrote, 'Happy New Year. Thank you for your support last year.'
目上の人に会ったら、まず『新年明けましておめでとうございます』と挨拶するのが無難だ。
When meeting someone senior, it's safe to first greet them with 'Happy New Year'.
友達同士では短く『明けおめ！』と言うこともあるが、仕事では使わない方がよい。
Among friends people may say the shortened 'Ake-ome!', but it's better not to use that at work.