We've got an old and large community, based on free Invision Power Board 1.2 (sic! not 1.3). 170k posts, 3,5k users. Currently trying to find a working way to convert it to XF. Any thoughts or experiences with this would be greatly appreciated. No IPB license present for a convertion to IPB 3.x (not sure it'd work properly anyway), so we would prefer a different (and free) approach. Thanx in advance for any help or advice!