Create a New Template:

File > New > Mail Message (Ctrl+Shift+M) > Enter Content > Click MS Button > Save As > Save As Type (Outlook Template) > File Name > Save.

By default, the Template saves in c:Documents and SettingnetidApplication dataMicrosoft templates.

To use the template: Tools > Forms > Choose Form > Look in > User Templates in the System > Browse to the template that you saved and Open it.