DEVONthink 2 databases - backward compatible?

Considering moving to a DEVONthink2 beta trial, could I please check whether the Dthink2 databases are backward compatible with Dthink 1x versions? I think not, but having some legacy PPC Mac’s at home that will never move beyond Tiger, I just want to consider various options before upgrading

V2 uses a completely different database format and therefore it’s not backwards compatible.