Whether you or your customers are using a PC or Mac, Internet Explorer 6+, FireFox or Safari, your website will be editable by you, and compatible with your customers' browsers.
Or if you speak techie: SouthCMS uses no 'client-side' components (like ActiveX) so that it is completely browser independent. This means that access to content is as unrestricted as possible to all types of users. And because it's built on a rock-solid platform of Linux/Unix, Apache, PHP/MySQL (which are renowned for their reliability and robustness), it doesn't use any Microsoft technology!