Every company does those two things to some degree. They increase their revenues by selling new stuff. Apple cuts their costs by dropping support for older stuff. It's just shrewd/inconsiderate marketing decisions. It would be Apple's choice to make it so. TLS version is not typically a reason to upgrade an operating system outside. I'm familiar with recent changes to SSL/TLS. The API lacks backward compatibility that would be required to run on older versions of Mac OS. Their explanation as I recall was that Apple provided the API their client SW is written against. However, they refuse to support their sync client on our version of Mac OS.

I chose the vendor because they support Windows and Mac. The original Mac Pro's main memory uses 667 MHz DDR2 ECC FB-DIMMs the early 2008 model uses 800 MHz ECC DDR2 FB-DIMMS, the 2009 and onward Mac Pro use 1066 MHz DDR3 ECC DIMMs for the standard models, and 1333 MHz DDR3 ECC DIMMs for systems configured with 2.66 GHz or faster CPUs. For example I use a cloud backup service. It gets worse than running an outdated OS. The implication was that only newer devices can be expected to work. Apple Support is awesome at calling people back, but the guy told me he couldn't help because my device is not supported. The error claims to be related to device verification, which gives contacting Apple Support as the remedy. Then your Apple-ID will work again and you can download 10.11 ElCapitan, which your computer can easily run. If there is no simple way to use a computer with newer than 10.8.5, or a phone with a more modern iOS, than CALL the number for the iTunes Store and give them the information over the telephone.

You need to have a valid payment method an your Apple-ID Account, AND if your payment method has been allowed to expire, you can no longer update it, IF you are still using 10.8.5 or older. If you have never upgrade your Macs, you already cannot do secure online backing, and very soon you will not even be able to casually access web sites with http S: at all. Since that moment, it has been being phased out in favor of TLS, and newer version of MacOS have reflected that. In spring of 2105, researchers discovered that Secure Socket Layer (SSL), the stuff that had been securing the Internet for quite a while, was not as secure as everyone thought. This has nothing to do with any conspiracy by Apple or anyone else to get you to buy a newer computer or anything else.

Apple mac pro early 2008