MS Office Courseware

I'm looking for any information regarding courseware for the office suite. Currently, I've designed all my own courseware for all of the office applications and am looking at investing in some professional material. We deliver hands-on, four hour sessions in beginning, intermediate and advanced levels for the core office applications. The ability to customize each class would be a definate plus (i.e. pull specific topics out of a broad range of topics to create each class). Any input would be greatly appreciated.