With a recent Thunderbird (and maybe Firefox?) update, Mozilla outdid itself. It changed profile files so that any profile could thereafter not be used with any previous version of Tbird. That is, if Tbird messed up and you want to go back to a previous version, it could not be done. Worse, this was done with automatic update, if one did not know enough to deny auto updates in the settings. Worse, something in the security settings or language of Tbird changed, so that some servers and ISPs could not be connected to except without any encryption of any type. So some people got booted off the www immediately after the update occurred, could not connect, could not go back to an older version. We got caught in this. My ISP's tech support said "Yeah, a lot of our customers got caught in that update. The only way to connect is with encryption set to NONE." He's right. No other connection will work. If encryption is used, there will be an error message: "Could not connect, password, user name or settings error." No encryption, no problem/ My question (since there are so many security folks here) is rather vague, but: can you imagine what kind of changes Mozilla must have made to have rendered encrypted connections impossible? I believe this is a problem with a few ISP/Mail providers, but not most. (The profile problem is another story.) Thanks for any thoughts.