Wilton, Depends on what version of Retrospect you are using? Check their website support page to address using their software on 10.4, there are special work around s for Tiger on all but the latest version of Retrospect. http://www.dantz.com/en/support/index.dtml Tiger Specific issues http://kb.dantz.com/display/2n/articleDirect/index.asp? aid=7971&r=0.7062799 Daniel J. Brieck Jr. On Oct 13, 2005, at 2:13 PM, whshaw wrote: > Hello, > I have an eMac using OS10.4.2. > I recently bought an external drive for backup. It came with a cd > containing Retrospect Express backup. At the time I was using OS > 10.3.9 and it worked fine. > Yesterday, I installed OS 10.4.2 and now, when I try to use the > backup I get a note saying "The application Retrospect Express quit > unexpectedly". I tried uninstalling and reinstalling with the same > result. > Does this mean the software won't work on 10.4.2? > Thanks > > Wilton