Formal or written equivalent of で when marking the place where an action or event occurs.
会議は本社にて行います。
The meeting will be held at the head office.
The meeting will be held at the head office.
Tickets will be sold at the venue.
Formal use marking the time at which something happens, ends, or takes effect; common in announcements such as 本日正午にて.
受付は午後五時にて終了いたします。
Reception will close at 5 p.m.
本日をもちまして、このサービスは終了にてございます。
As of today, this service is discontinued.
Formal or businesslike equivalent of で for the means, method, or medium used to do something.
詳細はメールにてお知らせします。
We will inform you of the details by email.
お支払いは現金にてお願いいたします。
Please pay in cash.
Literary or old-fashioned connective use after a noun or noun-like predicate, roughly like formal で or であって, sometimes implying a reason or result.
父は教師にて、母は看護師であった。
My father was a teacher, and my mother was a nurse.
彼は病弱にて、長旅には耐えられなかった。
He was frail, so he could not endure a long journey.
本日正午にて受付を終了いたします。
Registration will close as of noon today.
I will contact you with the details by e-mail.
をもって is another formal expression for means or an effective time, often in official notices, while にて is shorter and covers a broader range of formal uses.
で is the everyday particle for place, means, and connective uses, while にて is its formal or written counterpart used in announcements and business language.
Historically associated with に plus て and used much like a formal or literary counterpart of で; best learned as a fixed formal particle/conjunctive form.