Hello Ben, it is not outdated yet, but at the end of this year the support for V2 is over, so I would suggest to upgrade to V3 before the time runs out.
First to see if this is really the problem, quit Thunderbird, open Espionage, unlock the Thunderbird folders and then launch Thunderbird again. Does it now work fine?
If it doest, then the problem is that Espionage is not recognizing that it is Thunderbird being launched, so it does not unlock the folder before Thunderbird launches, making Thunderbird not finding the profile data, so it asks you which data you want to use...
To fix, this, right click onto thunderbird, select show package content and add Thunderbird.bin to Espionage and associate it with Thunderbird.
Quit Thunderbird, lock all folders and try to launch Thunderbird, see if it works fine now.
let me know if you need further help.
Zsolt