I have Thunderbird 17.0.7 with 5 email accounts operating within it. Does anyone know how I can set filters (such as sending incoming emails into particular folders) across ALL of my email addresses at once? It seems I can only do 1 at a time.
According to Mozilla's Wiki you can't (unless you want to manage messages in the "Local Folders"):
Thunderbird maintains its filters on a per-account basis
...TB's filters are organized/stored per account, with an exception for the "Local Folders" set of filters