OK I'm sold - I hear a lot of good things about OneNote but I struggled to understand the appeal on first glance. If it is good enough that you can find notes that far back then that could work well for me.
Btw Planner is great if you haven't used it. It's designed as a collaborative tool but I use it mostly as a way of keeping track of where I am with various tasks. I put it in my startup folder so it comes up as soon as I log on. I'll make checklists and basically talk to myself via card comments. Comments are timestamped and are forwarded to outlook so it's a better way of logging things than my usual method of digging through old Outlook messages. It has a couple of shortfalls but its really keeping me sane at the moment
File Manager is the best for bulk renaming too