InfoTip=E-mail and Messenger
IconFile=C:\Program Files\Microsoft Office\Office\OUTLOOK.EXE
The InfoTip will be the text that appears in the tooltip when you hold your mouse over the button. The IconFile represents the path to where the file is stored. Since a file may have more than one icon stored within it, the IconIndex points to the correct icon. ConfirmFileOp prevents a warning from appearing that this is a system folder.
"How come the icon isn't appearing?", you ask. There's one last step: we need to specify that the folder is a system folder. In my version of Windows 2000, you have to hop down to the command prompt to do this. Click Start>Run and type in 'cmd'. In the command window, you'll need to change to the directory that your folder is in. For those who don't remember the DOS days, type in 'cd \documents and settings\mylogin\favorites\links' where mylogin is the username you use to log into windows. Once you're in the right directory, type 'attrib +s myfolder' where myfolder is the name of the folder. If you have a bunch of folders you can do 'attrib +s *.*' to change all the folders to system folders.
You should now see the correct icons in the toolbar! Here's an example of how it should look: