The migration work could be hard if you are actively exchanging your documents with other parties, however, there are some work in which you do not have to share with other people. Those work were the best candidate to get the migration started.
As a personal user, your personal documents would be the great starting point. For example, if you are a (full time or part time) student, you can start with your homework. Most teachers would not love DOC format for they could generate shifting here and there due to different versions of the software. PDF should be much better in this case, and OpenOffice.org could provide PDF without problem.
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