A family of Microsoft word processing software products for creating web, email, and print documents.
It is not possible to save over a template "by accident." If what you have created is actually a template (.dotx or .dotm file), then the default action will be New rather than Open. A new blank document based on the template will be created and Save As will be required as a matter of course. If you are using a document as a quasi-template, then you should save the document as a true template.