Hi, I have made some research in that forum and on the ESET website, and I am still not able to know if, now in May 2010, the version 4.20 can work on a Windows Home Server. Last year I reached the conclusion that it was still not OK, and installed a concurrent product. However, I have 5 machines beside the server that are all running ESET under windows 7 64bits without problem, and I would really like to know for sure, before renewing my license with the concurrent product, if some substantial progress has been made tweaking ESET for Windows Home Server. Thanks. PS: Unless there is a serious tweaking in the price of the product when it comes to a server version, I do not personally think that buying a license for an product that cost 4 times the price of the operating system is a serious alternative when it comes to Windows Home Server.