Originally Posted by davidfor
The Kobo will sync annotations and bookmarks between their devices and apps for the kepub books.
If you are talking about epubs, they don't. But, the annotations are stored in a file, and that could be copied to another device. In fact, the file seems to be produced by ADE on the device, so it might be transferable to other ADE based devices or the PC app.
with ADE do you mean Adobe?
I only have epubs without Adobe Digital Editions