Hi. My windows 10 PC failed to boot a few days ago and after a long period of trying to salvage it, I wound up having to reset the Windows OS on it (Go figure) and that of course resulted in the loss of all of my 3rd party software and applications. I have since restored the PC and and the My Thunderbird email software. I did have a backup of my profile of sorts from a few months ago when I was forced to migrate email ISP companies from Cox Communications to Yahoo when Cox left the email industry last spring. I say 'of sorts' because I only kept the file structure from the actual profile down vice from Thunderbird down. And even if I had done that, it wouldn't work well since I copied out the profile before the switch to Yahoo, so the email accounts have the old Cox server info not the current Yahoo ones. I have come to terms with the email loss and I did take the opportunity to switch from POP3 to IMAP something I have been meaning to do for a while now. And I was able to copy over the Local Folders , so it's not all gloom and doom. But what I really need to get is the address book. I have tired to import it using the "import from another Thunderbird Installation" but that ended with an error condition. Is it possible to copy the address book from one profile to another? Oh and one last thing, Thank you for the ISP configuration data base that T'bird used to auto-configure the IMAP server setups. It made life much easier. Thanks for any help. Respectfully Mark B.