Well, it took a few days to really test this out but, unfortunately, it does not work for us. As it turns out, our Shared mailboxes do not have associated User Accounts and therefore, there are no credentials to enter. Since there are no credentials to enter, we cannot set up a separate account in Outlook for the Shared MBs that would in turn, allow Outlook to index the folder and include that in a "global search" of all mailboxes.
The only way to search a Shared MB for emails with KUTools is to select the exact Shared MB folder in which the sought email resides, select "Current folder" search option, and then search. This will not work for us as we have many folders and not way of knowing which folder(s) will have the emails.
If you have any more suggestions or changes in the future that enable search Shared MBs, please let me know. I have to move on and select a different solution. --Cliff