Update on this:
As background, my recent search was motivated by Outlook hanging up in the Send/Receive mode. It would lock up my PC, and I'd have to reboot in order to use the computer. I ultimately figured I had one or more corrupted files in the software, and I figured I'd ask around and see if there was some other program that would better suit my needs, seeing as how I was likely going to have to reload Outlook anyway.
I did try Thunderbird. Doesn't have the e-mail management options that Outlook has, required/desired for my use.
Ended up running a Microsoft repair utility that fixed Outlook. In the mean time, ran another program that showed my hard drive was failing.
In process of replacing the hard drive.
Thanks all for the suggestions.
(Moving to Computer forum.)