I had an .odt file which was synced via Ubuntu One. I made changes on the file on my Ubuntu Computer. To check whether the file was synced I opened it on my Windows computer. It was not synced, but ...
I had a folder (a backup of my Wii homebrew actually) synced with Ubuntu One. Unfortunately, I ran out of space on my hard drive, so I disabled Ubuntu One sync for a while and deleted the folder off ...