Chromebooks in school is a bad idea, as it won't get them used to what they will be using in the working world. OK for grade school maybe, as you wrote, but by high school, they need to be using full PC' and Office. Not because they/it are better, but just because that's the way it is now.
It will be 10-15 years before these elementary school pupils enter the working world. A lot of things can happen during this time. How do you know that office will continue to be the dominant word processing software a decade from now?
Besides, I also view it as a vicious cycle. If we teach the kids how to use office because that's what everyone is using now, it just perpetuates the whole trend of them continuing to use Office because that's the only software they know how to use and are comfortable with. Even if it may not necessarily be the best tool for the job.
How do you break bad religion? By giving it a fresh start. Start by introducing our children today to other alternatives other than Office and they may just start using, and clamouring for other alternatives when they grow up. Loud enough for bosses to actually sit up and take notice and start offering these alternatives.
Change has to start somewhere.
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Your last sentence kind of gives away the game.
What didn't you like about the collaboration in the current version of Office apps?
I'm not interested in a teacher who wants to raise the next generation of workers to shun or boycott what she doesn't like. I guess that makes reason #4,845,143 why we homeschool.
We use an iMac, two MacBook Airs, 4 iPads, an Android tablet, a Windows tablet, 2 desktop Windows machines, a Windows laptop, Office for Windows and Mac, Scrivener, and OpenOffice. My students choose the tools that work for them, I don't. And if they need such tools when it comes time to get a job, they'll have experience with all of them.
I don't know, since none of the school computers run the latest version of office, so I can't give my pupils that learning experience even if I wanted to.
I don't "boycott" Office out of some personal agenda. It just doesn't fit our use cases in the classroom. Everything the pupils do, some other tool does it better, be it google docs, some web tool like glogster or blogging.