I use Chrome as my browser. I would like to add a Chrome extension that will send a page link via Zimbra mail. When I look at the Chrome extensions that give me a choice to use either Gmail or my default mail program, I choose default. My problem comes when I try to select Zimbra Desktop as my default mail program in Windows 8. Zimbra does not appear as an optional default program. Is there a way in Windows 8 to select Zimbra as my default mail program?