Hi Im looking at upgrading my farm from Windows 2003 CPS 4.0 to Windows 2003 XenApp 4.5. We run Web Interface 4.2 with an old version of Citrix License Server. I will be upgrading the License Server to the latest so there should be no issues here. My queries are: 1) Will Web Interface need to be updated to the latest version for XenApp 4.5 to work or is WI 4.2 OK? 2) Will there be any issues if I do an inplace upgrade to XenApp 4.5 in the same farm and slowly upgrade? Therefore the farm will have a mix of 4.0 and 4.5 servers for up to 2 weeks. 3) Is it preferable to build new servers with XenApp 4.5 in the same farm (in seperate zones) and slowly port the applications/users across (there still would be a mix of 4.0 and 4.5 in the same farm only the installs would be clean)? Any guides/best practices on upgrading would be appreciated. Thanks Angela _________________________________________________________________ Get the latest news, goss and sport Make ninemsn your homepage! http://windowslive.ninemsn.com.au/article.aspx?id=813730