I updated to the lastest version of Thunderbird (Windows) a couple of days ago and ever since have been unable to send emails and my address book has disppeared. The two things seem to be connected as Thunderbird seems to refuse to send emails that do not have an address in my address book and as the address book has gone - no send! I can't even reply to incoming emails, the "send" button just stays grey (see attached example). Even if I type the email address - same result. If I try to add a contact to Address Book nothing happens when I hit "New Contact". The address book just comes up with the following strange messages: "Contacts from remote address books are not show until you search" note nothing happens when I search and "This addess book show contacts only after a search" again nothing. (Screenshot attached) I have tried copying address book from a back up of my profile that is a only a week or so old but nothing changes. I can see lots of abook-x.sqlite etc files in the back up profile but even deleting all of these in the working profile and copying the back up files in does nothing. Any help would be appreciated as I can't just keep using my mobile version to conduct business.