Did the update leave you with a request to define an email address? If so, your profile is probably still available and components can probably be recovered. You can check this with a few steps: - click help>troubleshootinginformation - scroll down to 'profile folder' and click 'open folder' - you are now in the profile in windows file explorer, click the back arrow to back up one folder - you are now in the ...appdata\roaming\thunderbird\profile folder, there may be more than one folder there, - look for abook.sqlite in each and last updated date. The one that is larger and older would be your addressbook. - if you have a POP account, look in the Mail folder for the account and message folders, such as inbox, inbox.msf. Those would be your message folders. TO activate the addressbook in thunderbird, click tools>import>importfromafile>importaddressbook>sqlitedatabasefile and then locate and select the discovered abook.sqlite. For the message files, a simple way is to - create local folder for each folder to retrieve - install the addon importeporttools if not already done - highlight new folder, rightclick and select the importexport option to import mbox and select one of the discovered message files (ignore the .msf files). - repeat above step for each messagefile.

Thanks David, The import function restored everything in one go.

My hard drive crashed and had to be replaced and since then I have lost my address book. I find it impossible to contact Thunderbird by email unless I make a donation. I have donated twice now! Is there anyway I can retrieve this as I have tried the above solutions. Many thanks.