icayhwm thanks for the update. Here's mine:
I contacted Apple support online to receive a phone call. I showed the tech support person the issue with Apple Mail, which we ran through a couple of times did a force quit. He suggested a safe application, which involves starting the application while pressing down the shift key. That didn't change anything
I also showed him the issue with Contacts about how it freezes up.
He put me on hold and did some research. It turns out that the Mail application is a known issue to Apple, and they are working on a fix. He thinks that the Contacts issue may be connected, but he didn't know for sure
I showed him my activity monitor screen. I showed him how contactsd and mds-stores are taking up a huge amount of cpu capacity (over 150%). He said that contactsd is used to run Contacts. He didn’t know what mds-stores is.
He said that Apple will send a software update when the fix is available. He could not estimate when that will be. He had no recommendation for a Gmail client for my MacBook Air.
I have downloaded a Gmail client from the App Store for my MacBook Air, called Mail for Gmail, and started using it. It's been a learning curve. so far I'd rate it about 7.5 out of 10. It does download and send out my emails, with an interface similar to Gmail on the web. And it does sort the incoming mail into the Gmail categories: Primary, Promotions, Social, Forums, etc. On the downside, the interface isn't as smooth and simple as Apple Mail. And there are certain things that are tricky and not intuitively obvious. Also an issue: I now have to deal with two interfaces for managing my emails, this one on my MacBook Air, and Apple Mail on my iPone and iPad. Bottom line: I'll continue using this one for the time being, and look forward to the Apple Mail fix from Apple.
I do appreciate everyone's contributions on this thread. Let's continue to keep each other updated!