My all time favorite film is The Shop Around the Corner, played by Jimmy Stewart and Margaret Sullivan. The actors and actresses all did a fantastic job; so fantastic, that I usually watch this movie several times a year! *Grin*
The review on Netflix.com says:
In Ernst Lubitsch's charming, Budapest-set romance -- later remade as You've Got Mail -- Klara (Margaret Sullavan) and Alfred (James Stewart) fall in love, even though they've met only as pen pals and don't know each other's names. Over Alfred's objections, Klara is hired in the shop where he works. As they continue their loving correspondence, they embark on a combative working relationship. What will happen when the truth comes to light?