I think i might have found the solution to the SharePoint issue
After asking around the office, I have discovered that SharePoint 2003 MAY be running service pack 2, if this is the case then the solution may be simply to upgrade to Service Pack 3 and install any hotfix’s that are available. It appeared that a handful of people have had a similar issues (not exactly the same but similar) and their issues have been fixed by upgrading.
It is clear from issues such as this that we NEED to upgrade to either SharePoint 2010/Online, it is a much easier platform to use and manipulate.
After some research around the SharePoint 2003 issue, I have come to believe that the problem with the RTE error is not the browser but the operating system. I know this might sound strange as it should not affect the operation of SharePoint on the browser. If this is the case, I have seen a number of fixes for this on the internet, they mostly involve a hack. I will test this theory more when I get to work tomorrow (I have been researching from home today)
I was wrong
Michael and I have been presented with a challenge involving SharePoint 2003, to attempt to resolve a very strange compatibility issue. A content editor is used to input text and images into a SharePoint site, it uses a Rich Text editor to format the text, for some reason the Rich Text Editor (RTE) will work perfectly fine using Internet Explorer 7, however it will not work in any newer versions of Internet Explorer or any other web browser. This is a very odd Error as it is assumed that Microsoft would try keep it compatible with future updates.
Along with the Microsoft SharePoint research, over the next few weeks we will be looking into this issue and will attempt to resolve it.