Quick note:
The way you can tell if your book or document is supported by whispersync, is to open the book and click on the menu. If the option: "sync to furthest page read" is greyed out, then it's not sync-able.
A sync-able book or document will always have that option available, even if its the very first time you're opening that book. If it's the first time you're opening it, it'll just tell you that you're already at the furthest page.
For Calibre users: I've noticed that some books (usually AZW's and AZW3's) that have been converted to mobi format and then emailed with the word "convert", will often not be sync-able for some reason. I'm not sure why. I've found that converting them to epub's and then back to mobi again seems to fix this.
So if you're having a problem with a book or document that isn't syncing, try converting it to epub and then convert the new epub to mobi and email that one.
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