You can attach a variety of files to a fax message using the ‘Attach File ...’ option. Supported (attachable files) include:
*.DOC, *.RTF, *.TXT Microsoft Word must be installed on server machine.
*.PPS Microsoft Power Point must be installed on server.
*.HTML, *.HTM Internet Explorer must be installed on server.
*.PDF Adobe Acrobat Reader must be installed on server.
TIFF
JPEG
Bitmap
PCX Files
If you want to fax a document or file type which is not on the above list, simply open the file you want to fax, go to File->Print and choose ‘Impact Outlook Client.’
You can attach multiple files by repeating the ‘Attach File’ process for every attachment. You can switch between the attachments by clicking on the individual items listed in the attachment filed. Clicking on the attachment will display the currently selected attachment in the preview pane.

The current attachment can be deleted by selecting the ‘Delete Attachment(s)’ in the File menu or by selecting the item and pressing the delete key.