The Office meets Parfumerie/She Loves Me/Shop Around the Corner/You've Got Mail. Pam and Jim meet earlier in life in AOL trivia chatrooms without knowing who each other are. 

In addition to the above-mentioned sources, also owes a lot to a number of fics on this site, most notably Expressions in Emoticons and the Love-Song of Squirrel McPants. 

Now Complete: AU, starting before S1 (and thus also a Prior Meeting), running into S2.