On Friday 16 January 2015 01:45:53 Michael Gilbert wrote: > > However, the problem reported here is not a usability problem. If a mail > > client losing record of which mails have been read and which haven't > > isn't "non-serious data loss", I can't tell what is. > > Actual data loss. > So, the bits marking messages as "read" or "unread" are not data? What, pray tell, are they?