There are good mechanical switches that are silent. For example Cherry MX Silent Red. I also have a keyboard with Cherry MX Browns with o-rings to dampen them a

There are good mechanical switches that are silent. For example Cherry MX Silent Red. I also have a keyboard with Cherry MX Browns with o-rings to dampen them a little bit. There is no excuse, other than being totally obnoxious prick, for using a loud keyboard in an open office.