I did follow up with emails and even a phone call. When there was no response to my follow ups I assumed the problem had been resolved.

As for not taking the time to find a reader, according to the file type, it is a Word HTML file. I am a Mac user and Word for the Mac will not open the file. And yes, I could probably spent more time searching for a reader, but come on, an invoice from Microsoft should be in a more common format. Heck the Word standard doc format would have been helpful. And there is no excuse for not responding to my request to re-send the invoice. The collection agency had no problems sending the invoice to me in a PDF.

-KIRBY