Versions of web browsers like Internet Explorer version 6 or older may not have this shortcut to the 'Zoom' function. Instead you may be able to increase text size using the 'Zoom' options, which become visible when you left click once on the 'View' tab at the top of the browser and then place your mouse over the arrow to the right of 'Zoom'. To get a newer version of the Internet Explorer for free visit Microsoft at http://www.microsoft.com/windows/Internet-explorer/default.aspx.