Office has been acting buggy on my phone recently. First it tried to convince me that my OneNote notebook had been deleted. Then it wouldn’t find changes that I knew were synced. Fortunately I was able to find an answers.microsoft help page that explained the fix. All I needed to do was reset Office from the Settings–>Applications tab. I pressed and held on Office and selected “reset”. I don’t have any docs saved directly to my phone (why bother when they can be on Sky Drive?!) so I didn’t worry about the warning. When the process was finished I had to reenter my name for group commenting and voila, ready to go. I went back to the office tile, and a few moments later my files had all cleanly synced via WIFI! I might just do that on a regular basis to clear the file memory.