We dropped support for the outlook (express) address book, so this could be closed? Regarding the category field, this is tracked by bug 75711. I currently have no plans to move my add-on into core, but I think it when tags are coming, something similar will be implemented.
Bug 204070 Comment 6 Edit History
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We dropped support for the outlook (express) address book, so this could be closed? Regarding the category field, this is tracked by bug 75711. I currently have no plans to move my add-on into core, but I think when tags are coming, something similar will be implemented.