Ever since changing to Thunderbird as the email client, I've had almost zero problems with it until recently in the past few months.
However, when it does have issues, support is knowledge base articles and community volunteer based (with moderation) and that is pretty much it. When the problem is beyond the standard how-to's and the built-in tools in Thunderbird, you're pretty much stuck.
This was the issue I faced a few times this year. IMAP connection related issues, automatic filtering issues, etc. Issues that were obviously beyond the technical expertise of our volunteer troubleshooters.
Its time Thunderbird invested some of its budget to put together a proper technical support structure to deal with issues that may require developer interaction.
