Local directory path not suitable for message storage?

So we have multiple issues here. 1. Protected paths. https://support.mozilla.org/en-US/kb/dangerous-directories-Thunderbird-account-settings Please right click the "Local Folders" account and check that the path in Settings is as shown in your post. I am just a little perturbed that the first part is showing as a UNC path with the \\ 2. Password issues on ATT. That is about as vanilla as it gets around here, for reasons best understood by ATT you need to use a mailkey you get from their website, not your ATT password, to retreive email. Recent changes mean that oAuth authentication can also be used with ATT, but I am not sure if they have arrived at a release version as yet. If it is an option use it instead of a password. Note that "Server error" part is usually reported by folk using their ATT password for mail instead of a mailkey when asked for their password.