It's been so long since I have used System 9, I really can not remember where things are. I believe in the Sysytem Folder, he will find "Preferences" and should look for anything with a reference to IE. Tell him to remove anything he finds, place them in a new folder, and remember where they came from if he experiences a major breakdown with the browser.
From Google, here are supported browsers for Gmail:
You can access Gmail at [mail.google.com...] wherever you have an Internet connection via a PC, Linux, or Macintosh (Mac) computer. To take advantage of the newest Gmail features, you'll need to use one of the following fully supported browsers:
* Google Chrome (download: Windows) * Firefox 2.0+ (download: Windows Mac Linux) * Internet Explorer 6.0+ (We recommend Internet Explorer 7.0 for the best experience.) * Safari 3.0 (download: Mac)
You can also get access Gmail -- but you won't have some of the latest features -- with any of the following browsers:
* IE 5.5+ (download: Windows) * Netscape 7.1+ (download: Windows Mac Linux) * Mozilla 1.4+ (download: Windows Mac Linux) * Firefox 0.8+ (download: Windows Mac Linux) * Safari 1.3+ (download: Mac)
If you use a browser other than those listed above, you'll be automatically directed to the basic HTML view of Gmail. Basic HTML view works with the following browsers, as well as many others:
* IE 4.0+ * Netscape 4.07+ * Opera 6.03+
I know this is obvious, but he is using ancient technology, kind of like using Windows 98.