I have been using Thunderbird for many years. Today, I discovered that my primary address book (with dozens of lists and several thousand contacts) has disappeared from the "All Address Books" list. 38 other address books are listed in "All Address Books" including Personal Address Book and Collected Addresses. My profile folder contains abook.mab, history.mab, and abook-1.mab through abook-33.mab. One file -- abook-31.mab -- is 1.18MB, opens in Word as 325 pages, and contains some of the names that would have been in the missing address book. These names are not in any of the other 38 address books.

Any advice on how to restore the missing address book will be appreciated.