I recently acquired my first MACAirbook (I'm a dyed in the wool PC guy). I went to an online continuing education course, and "printed" my certificate using "Microsoft Print to PDF" (my local printer wasn't available due to security issues on the education website). I selected "Desktop" as the location for the print (and subsequently I selected "Documents" and "Downloads"). However, when I went to my Desktop (and Downloads and Documents) to find the PDF file, nothing is there. How do I find out where the MAC put my document(s)?