Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Ubuntu user may wih to note that this extension is also now hosted in a PPA at https://launchpad.net/~markjtully/+archive/ppa as a package named xul-ext-evolution-mirror. If you wish to install the extension using the PPA instead, you should first uninstall the version obtained from addons.mozilla.org.