Cannot set an existend account

i still need help !!!

<blockquote> I'm currently having a problem with Thunderbird version 15.9. </blockquote> 159.0? <blockquote> I can no longer sign in to my Google-Account after I set new passwords and entered them in Thunderbird. </blockquote> New password'''s''' for multiple accounts, or for a single account? In the letter case, why multiple passwords? For changing your Google account password, you'll have to login to your Google account via browser and change the password there. Just changing the password Thunderbird has remembered, does not change your account password. Having said that, Gmail uses OAuth2 authentication. That means Thunderbird does not save your actual account password, but an authentication token. <blockquote> I then deleted all entries related to my Google account. </blockquote> What entries? Did you delete the entire account? <blockquote> Adding the existing account again failed. I received two error messages. Error message 1: “Waiting for authorization during sign-in". </blockquote> OAuth2 authentication is done using your default browser. After successful authentication you'll be re-directed to Thunderbird. If this is not what you're seeing please provide screenshots of what you're doing, and what happens. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem <blockquote> Error message 2: “The inbox server is already in use.” </blockquote> Might happen if you didn't delete the account prior to re-creating it.