Yes, ADERANT Expert (formally CMS) is old at the core*, though does now have brand new stuff (so called Golden Gate/Windows Foundation) around the periphery and which will, very, gradually replace the 'core' stuff - and the old and new will still work together around the common database schema. It's also true to say that non-Expert clients are being encouraged to move to Expert (and that some 'services' costs are involved, which can run into 6 figures). So it's true to say 'no clients left behind', but that non Expert clients may need to pay somewhat. * I must admit that the 'old' core is still incredibly flexible; I was doing things 10 years ago with it that you would have stuggled to do with any other PMS. Even just the other month I was using it to interact directly with core server components to achieve 'witchcraft' without the use of .NET etc. 3E is new, and has some great features (I've spoken to new clients who are very pleased and impressed), and while still retaining a certain degree of proprietary technology/methodology, is combined with the ability to be fully interoperable with the Microsoft stack. And it's also true to say that existing clients were, and are, unhappy about the fundamental, chargeable, nature of upgrades. Frankly now that 3E is seen is being implemented, stable and mature then you pays your money and takes your choice. Personally I believe a lot of the differences are more about the implementation services and complexity of implementation than they are around the fundamental nature of the products. It's good to have healthy competition... However the one thing I am picking up on is that both products are seen as expensive in terms of the cost of services direct from the suppliers, that suppliers need to pay more notice to existing clients (who are the best sales force), and that the purchase / license model of both products is seen as outdated. Whilst lease arrangements can be made by 3rd parties to offset the cash flow impacts of the products, then I believe that the next key differentiator between the two will be the availability of the products on a SaaS model, both installed locally and hosted. I would not be surprised if we start to see such availability in the near future once the suppliers can adjust their internal processes and business models, partially driven by the fact that other competitive products are also available on an SaaS model.