Nice idea. Doesn´t work, though. Rated 1 out of 5 stars
I was using version 1.0.2 on Thunderbird 126.96.36.199 on a WinXP machine.
First let me state that this tool is potentially very useful. I hope that this tool will work some day.
The feature I found most irritating was that despite my checking the appropriate box under the settings I was never ever asked when a conflict arose between server and local data. Example: when I had 4 to-dos on the server, but 6 stored locally, the program simply deleted the two unmatched local items (it did this dozens of times). This really is a kiss of death for any synchronization tool, sorry.