"Why is it marked solved"

Because that is what the Original person asking, gets to note for their own reasons. If you did not originate a topic, you don't control if that is Solved or not.

You can thank MicroSoft for dropping support of Windows 7 in Jan 2020. You can thank Microsoft for everything about Outlook, too.

"Doesn't ProSeries care about us to keep current with problems, when they are not solved?"

This is a Peer User Community. This is not Tech Support or Customer Support.