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About this Add-on
This add-on scans all contact-cards of the currently selected addressbook, extracts all categories and displays a list inside the Thunderbird addressbook. It allows to rename and to remove a category (changes the category string in all member contact cards).
To be able to use this Add-On, you need to have a CardDAV-Server (e.g. SOGo, ownCloud, Baikal) and the SOGo-Connector Add-On needs to be installed (to hook at least one CardDAV adressbook into Thunderbird).
Added the "auto-select-all-category-members" feature at the contacts-sidebar: If a category is selected, all members are pre-selected now, which speeds up the process of sending a mail to a category from the contacts-sidebar.
In Thunderbird 38, a new combined top-level addressbook has been introduced. CategoryManager will now display all categories of all addressbooks (merging same-name-categories), if this top-level addressbook is selected. CategoryManager edit-options are disabled for the top-level addressbook.