In the mid 1990's websites and surfing were just coming into the popular mind. The forerunner to Tech-Trends, ITB was selling businesses the idea of presenting their goods and services on-line. Today every business accepts the need for a website, but too many businesses put up with website that can only be seen on a desktop computer using Microsoft Internet Explorer. The trouble is that visitors expect to see far more content, they want it up to date, and they want to use their tablet PC or smart-phone to view it.
The standards expected by both the modern user and web browser have changed. If it is difficult for your visitors to find the information they want because your website can't be navigated on a smart phone or tablet PC, you will lose customers.
If your website meets the W3C coding standards you can be sure that most people will be able to see your content. Try out the W3C validator on your website, our website, your competitors website, and a few famous large corporation websites. Don't listen to excuses for poor coding. Websites that meet the W3C standards are viewable by all truly compliant web browsers, those that do not conform may not be readable after the next browser upgrade.
Many people make the mistake of assuming that most people use Internet Explorer and are surprised to learn that it accounts for only 25% (March 2001) of web usage. See http://www.w3schools.com/browsers/browsers_stats.asp for up to date figures. Don't forget that in some user groups a particular web browser might have a different market share. For example, the Opera browser has really good accessibility support (amongst many other features) so might have a much higher usage amongst users with visual impairment. We use it becuase it is super fast and has handy tools for website developers.