Chris_Pratley's OneNote WebLog : Using OneNote on two or more machines: "One question I hear pretty often is: 'hey, I have two machines with OneNote - how do I keep my notes in sync?' There are a lot of ways to do this. In some ways it depends on what your needs are. After all, what doesn't?
First, be certain that you have Sp1 of OneNote. Use Help/Get Updates to check if you are not sure. SP1 has some adjustments to perform better when using files across multiple machines.
Next, decide if you want to sync all your notes or just have a portion of your notebook available on both machines.
Next decide if you need to have the notes accessible when you do not have access to your network.
Now, here are some typical ways"...
Interesting snapshot. Curious that Chris Pratley didn't include Groove in his list; two people who commented on the post did, however.