Originally Posted by Beantown Bronco
It's not Jenna Fisher - "the receptionist - Pam" if that's who you're thinking. It's Amy Adams, who actually did have a 2 or 3 episode cameo appearance in The Office as Jim's girlfriend before he started dating Pam.
Actually she was just there as a sales lady as I recall. Her character never dated Jim. Rashida Jones played a character that Jim dated.