I tried version 6 a few month ago because the small company I work for wanted to buy an ERP and I wanted to show them the ones available. I would like to warn anyone trying to use OpenERP. It's a mess, install it and try for yourself for a week or two before deciding on going for it. It's full of bugs. Their forum sucks, the community is made of people that don't want to share their solutions because they want to sell them, but that backfires cause I needed to show it to management but couldnt because all the errors. All that javascript interface is slow and as soon as you try to do something a bit out of the expected it starts giving lots of error for which you wont find a solution searching on the web. It's a crappy software they try to sell and rape you later with tech support.