CrossOver Linux allows you to install many popular Windows productivity applications, plugins and games in Linux. You can think of it as an emulator, but it's different, because there's no Windows OS license required. Your applications integrate seamlessly with your Gnome or KDE environment. It's like running Windows on your Linux machine, but without Windows. No rebooting, no switching to a virtual machine, and no Windows Operating System license required!
CrossOver Linux lets you use many Windows plugins directly from your Linux browser. Plugins work on any x86 based Linux distribution and will integrate with most browsers including Firefox, Netscape, Konqueror, Mozilla, and Opera. CrossOver also integrates with Gnome and KDE to let you transparently open any Word, Excel or PowerPoint file. But even better, you can open these attachment types directly from any mail client.