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CloseReview for SyncKolab by Gerid
Rated 4 out of 5 stars
Advantage over web-based address book/calendar is that one has a local copy. Version 0.5.3 is an improvement. Earlier versions sometimes deleted entries for unclear reasons.
This review is for a previous version of the add-on (0.5.2).To create your own collections, you must have a Mozilla Add-ons account.