Christmas Day marked the start of Film Forum’s week-long, 35mm run of the director Ernst Lubitsch’s perennial holiday classic, The Shop Around the Corner. Itself based on a play by Miklós László, Corner’s enduring appeal has led to the spawning of two remakes: a 1949 musical version, In the Good Old Summertime, and Nora Ephron’s 1998 charmer You’ve Got Mail, which updated the movie’s pen-pal-generated romance for the age of the internet. But Lubitsch’s effort remains the definitive one. Where many of his movies centered on the travails of the privileged and the wealthy — movies of “art deco nightclubs, shimmering silk gowns, [and] slamming bedroom doors,” in the words of the critic Dave Kehr — Corner focuses with great humanity on working-class hardships. James Stewart and Margaret Sullavan star as the two bickering co-workers (in a Budapest department store) who don’t realize that they’re falling for each other through the mail.

Dec. 26-31, 12:30, 2:40, 4:45, 7 & 9:15 p.m., 2014