Syncing Thunderbird contacts with UbuntuOne previously relied on the Funambol sync client, which used UbuntuOne's beta phone sync feature to basically treat Thunderbird as a phone. With the introduction of paid syncing for phones, it doesn't seem like there is anyway to sync Thunderbird contacts with UbuntuOne without paying for a phone plan. Since that seems a little steep to just get that single piece of functionality, I was wondering if there are any other ways to sync Thunderbird contacts with UbuntuOne - either through couchDB or perhaps mirroring Thunderbird contacts to Evolution?
(There is a question on this general topic already: UbuntuOne contact synching for Thunderbird? , however, this is from before the plan and pricing restructuring was done and the answer provided is to use Funambol in UbuntuOne, so I thought it better to open a new question)