I do not know how I got to here. All has been fine since I got my new laptop (HP Pavilion dv5 / WIN 7) and installed fresh versions of MS Office and Mozilla FF and TB.
Suddenly, TB browser has: "forgotten" the passwords for the three e-mail accounts it manages and gives no opportunity to input either; downloaded header data but no content for the most active one of the three accounts; and gives the following error, when I click "get mail" for the most active account-- "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox." Like, why do I not have such privileges? I am the only one who has been using this machine.