For each writing paper, you'll have the choice between :

1. Either download an "exe" file that will automatically moves the writing paper into Windows stationery folder
(C:\Program Files\Common Files\Microsoft Shared\Stationery).

2. Or download a zipped file in which you'll find an "email" (eml format) ready to be used.

3. Or download an "incredimail" file.

4. Or save the background by a right-click ("jpg" or "gif" format).

You'll be able to set them up into Outlook Express by following the short tutorial here :