I don't know as
a. office documentation on this subject always suggests that you only have
to sign up once, and the necessary entries in the Windows registry are not
obviously documented anywhere
b. I don't have an internet fax service set up here so cannot examine the
relevant registry entries either.

But what I suggest you do is
a. ask the same question in the Outlook Fax group, where you are more
likely to find people who are using Internet fax
b. consider having a look at the Windows registry: proceed with caution and
don't change anything unless you know what you are doing,
- open the registry editor (regedit.exe, typically in your Windows folder)
- look for the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common\Services\Fax

- is it there?
- if so, what is in it? (each key may have values and subkeys) Is there
anything that suggests that something has to be set up for each program that
uses Internet fax?

Peter Jamieson