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CategoryManager 2 2.04 Requires Restart
by John Bieling
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
About this Add-on
Note: Category Manager 1.xx depended heavily on the SOGo-Connector and could not function without it, which limited its usage. This dependency was removed with Category Manager 2.xx, so category based contact groups can now be used with standard Thunderbird address books as well. If the SOGo-Connector is installed, categories will of course be synchronized with remote CardDAV servers as before.
This add-on is not compatible with your version of Thunderbird because of the following: