[Radioactive]

I tried to duplicate your problem.

Yep. Sure enough you are correct. I never noticed that before, probably because I never fax anybody.

The Mickey Mouse way to fix it would to be to prefix the fax number with a letter or the word Fax in the number field to make the number invalid to Outlook.

You could get a 3rd party app but that costs money.

Let me see what else I can find.