New versions of Thunderbird will now be released in cycles of 6 – 12 weeks. Even though the new version numbers sound like major releases, they really are not. You are likely to notice very little in the way of changes when new versions are released even with a major change in version number. One thing to bear in mind is if you have installed add-ons for Thunderbird, they may not be compatible with the new releases until the developer of the add-on provides an update.
This means the Thunderbird 6 Easy-Email Guides are valid for newer versions of Thunderbird as well.
Should this change we will release a new version of the guide and anyone who has purchased a Thunderbird 6 Advanced Guide will be entitled to a free upgrade.