Ok Marc, I was probably not understanding just what you want to do...may not now...but you cannot delete Calendar as it is part of Mac OS X. If your Calendar is not working correctly you might try a reinstall of the Mac OS X you have. Your information says you have 10.6.8 so you might want to backup all of your data if you can, then reboot the computer on the Mac OS X install disk by holding the C key during the startup. Then accept the language and do an install, don't do a clean install or erase install as those will eraxe everything on the hard drive. A simple reinstall will only install the operating system. You can then on-line update to 10.6.8 so you have the latest version. That process should fix problems with Calendar if there is an error in the calendar application itself.