Thanks, Brink for your suggestion to COPY all Contacts, instead of Exporting them (as I used to do with the Windows Address Book). So, it seems that when I want to synchronize the Contact lists on 2 computers, there is no way to merge the COPIED contacts from one computer with the existing Contacts on the other computer.
Instead, the only way I can figure it is to designate one computer to be the main one for Contacts, and then periodically simply COPY all the Contacts onto the other computer, replacing all the existing Contacts on that other computer. It's not perfect, but this should work for me.
By the way, I still terribly miss the ability to see which Groups a person belongs to. When someone emails me, saying: "Please remove me from your mailing list", I have no idea which of the many mailing lists he/she is talking about. He/she may be in more than one Group. I have to check them all to make sure the person is removed from each of the Groups I may have set him/her up on.
I can't understand how Microsoft can claim that Windows Mail retains all the features of Outlook Express, when it obviously doesn't.
Another Outlook Express feature I miss is the ability to copy someone's email address directly from the Summary tab (when someone asks me for an email address). The ability to copy that email address has been disabled. I can only look at it, but I cannot highlight it or copy it. Even right-clicking on the email address in the Summary tab doesn't do anything! Instead, I have to go to the "Name and Email" tag, and click on EDIT, pretending I am about to edit the email address, and only then can I highlight it and copy it. It may seem like only a minor annoyance having to do a few extra clicks, but it can be a big annoyance if you have to do it a lot (which I do).
I hope Microsoft is paying attention to this Forum, and may fix things in the next version of Windows. Bring back all the Outlook Express features that were left out of Windows Mail. Why did they have to mess with a good thing to begin with?