Holly Flax returns, but where is Toby on "Office"?

nbc says:

Universal City, CA - June 30, 2008 - Golden Globe and Academy-Award nominee Amy Ryan reprises her guest-starring role as Human Resources representative, Holly Flax, for multiple episodes in season five of the Emmy-Award-winning comedy "The Office." Amy Ryan's character, Holly Flax, was introduced in the season four finale episode, "Goodbye, Toby," as Toby Flenderson's (played by Paul Lieberstein) human resources replacement.

"The Office" season five premieres Thursday, September 25 (9:00-10:00 PM ET/PT) on NBC and picks-up from last season's finale, in which Holly Flax (Amy Ryan) joined the Dunder-Mifflin office the day of Toby's big going away party and seemed to strike a special friendship with Michael Scott (Golden-Globe Winner, Steve Carell) and Kevin Malone (Brian Baumgartner).

"Amy gave the character of 'Holly' an openness and matured innocence that exposed a new side of Michael (Steve Carell). She placed her character right on his level. With her, we now go into our fifth season with the possibilities of our first," said Paul Lieberstein, who was recently promoted to executive producer for season five and previously served as co-executive producer of "The Office."