Exchange calendars, not showing up in Apple calendar.

Because 38 people looked at this post, I am posting my resolution to this problem, even though I created the original post. I hired an Apple-certified technician to look at my computer to see if he could get the calendar working. He told me that to fix the problem, I needed to reinstall the operating system as if it were a new computer and not restore it from a time machine backup. The problem had nothing to do directly with the version of the operating system; rather, some part of the complex code that made the operating system work properly became corrupt. Also, his opinion was that X.4 of a given operating system is too new to upgrade to. Therefore, upgrading to such an operating system could cause some data as in my case to become corrupt.

The exact steps I followed are: First, I erased the internal SSD. Then, I installed the original operating system. Next, I updated the operating system to the newest version. Finally, I added all of my accounts back onto the computer. Because everything, including documents, was stored in the cloud, the only thing I had to retrieve from the Internet was my applications. Everything now works perfectly.

I should mention I am running OS 14.3.1.