OpenSolver 1.1beta is now available for download. OpenSolver can now run in Excel 2010 as well as 2007, and solves much larger problems and does so more quickly. (We tested on a problem with 70,000 variables and 70,000 constraints sent in by a user!) There are lots of little bug fixes and big improvements, including an AutoModel feature that provides an optional alternative to the Solver dialog; many thanks to my student Iain Dunning for coding this up. We now also check that the model is linear, and highlight any problems. Thanks to Kathleen Gilbert for working over her holidays to make these improvements. You can download the beta here. We look forward to your feedback.