Thank you very much johnrfsr and edfair for your further posts in this thread.
Yes, I have now found the favorites folder at C:\Windows\Favorites after I selected the "show hidden files option"
The folder is described as a "Shell Favorite Folder". That I can easily now copy/save/transfer to other machines.
The address book is at C:\Windows\Application Data\Microsoft\Address Book. It is the .wab file you need, not the other one with a .wa^ extension. If transferring this .wab file to another machine, it may well be that the other machine gives its address book a different name (but it will still be of extension .wab). In this case :-
1. In the other machine, re-name its address book from XYZ.wab to XYZold.wab (so you can retrieve it if ever this is needed)
2. Copy the new .wab into the other machine at the same place.
3. Then re-name the newly copied file XYZ.wab. This works for me.
About the location of Outlook Express files, I always make a folder C:\My Documents\E-Mail Files and specify to Outlook Express that this is where I want my e mail stuff to be located. Then when periodically I back up My Documents onto a second hdd and also onto a second or third computer, I know that all the latest e mail stuff will be there safe and sound.
I would never not have a second hard drive in any fixed machine upon which I rely for data retention, and I use it for data back-up on a very regular basis.
All above comments relate to Win98SE OS.