Outlook /OWA should support templates

Anastasia, our accountant keeps a bunch of text documents on her desktop which she copies and pastes into emails. It would be a great feature if Outlook and OWA supported creating and inserting templates into new emails. If the new email UI had a drop down list to insert templates then this would make outlook a more powerful tool.

There are already some third party plugins that do this in Outlook:

But there are no tools to do this in OWA.