How do I conditional format a cell by referencing another workbook's
failure/success outcome?

Here's what I have:
Workbook #1 = a fax list with customer IDs and fax numbers
Setup as follows:
USER ID USER NAME FAX NUMBER
0125A Mom & Pop's Store 16135847581

Workbook #2 = a report from our autofaxing company stating whether the fax
was sent or failed.
Setup:
RECIPIENT SENT PAGES BILLING CODE STATUS
16135847581 date/time 1 845695 Success

I am trying to change the cell's/row's format (colour) in workbook #1 by
referencing it to workbook #2. The "primary key" for the reference is the fax
number.