For quite some time now, I regularly get folders appearing either in my Trash bin or outside it with names like "Inbox_PCNAME_Jan-09-122251-2016_Conflict_ADMIN_Jan-18-082650-2016_Conflict", where PCNAME is the name of my PC. I initially wondered whether it had anything to do with the compacting process while running my Synology cloud station backup, but it also seems to happen when this is turned of. I keep on deleting these folders, but each time I start Thunderbird, two of these appear. Also, on at least two occasions, emails downloaded into my Inbox (local folder) were corrupted - e.g. the email content from one sender was actually showing up under the heading of another sender, or the email would be blank (and, on clicking reply, no addressee would appear despite the sender showing up on the original mail). To be more clear, if "Bob" sent me an email saying "Hello" and "John" and email saying "How are you", then by clicking on "Bob's" email the content "How are you" would appear. Can anyone help please? Thanks.