Michael initially dislikes her because she is part of Human Resources, but quickly falls in love with her.
She is subjected to hazing by Dwight Schrute, who convinces her that Kevin Malone is mentally challenged, a belief she continued to harbor until Season Five when it was embarrassingly pointed out to her that he wasn't.
It is also revealed that she is dating one of the salesmen there, A. David Wallace lets Holly and Michael do a skit about the history of Dunder Mifflin; the two decide to do a skit that spoofs Slumdog Millionaire.
J., which deeply upsets Michael and makes him unable to do his presentation; he ultimately breaks down and asks her boyfriend about Holly in front of everyone before leaving. The presentation goes horribly and gets worse when they reveal that the Buffalo branch is closing down, much to everyone's surprise.
Michael tells Holly he will treat her poorly in front of Jan during her baby shower because he has a vested interest in Jan's baby, which is not his.
Despite being told of this, she is shown to be uncomfortable with Michael's attitude toward her.
She was an original character, and not based on a character from the British version of the show.
At the office, Michael proposes to her with the help of their co-workers.
She and Michael eventually get back together, move to Colorado, marry and start a family together.
During an attempt to put a raccoon in Holly's car, a Toyota Camry Solara convertible, Dwight is berated by Michael, who takes Holly's side and loudly proclaims that she is the "best thing that has happened to him and the company since World War II." Holly invites Michael to go out for dessert after Toby's going away party, but Michael turns her down, opting instead to go with Jan Levinson, who is pregnant and had asked Michael to be there as if he were the child's father.
Michael had been courting Holly in the first episode of the season.