Which Apple app's will no longer work in Mavericks?

Question

I am using OS 10.8.5 on my MacbookAir.  I was contacted by Apple to download a free update to Mavericks, OS 10.9.
I am very suspicious after having been many times forced to buy new apps working under newer Apple operating systems, because some previouly working apps suddenly no longer did after an Apple System upgrade was installed.
I lost mountains of important files created with Applesworks, including important spread sheets and data files which suddenly no longer opened because the Apple appllication used to create them was no longer supported by the newer Apple OS.
I also recall the total mess with earlier iMovie and iDVD updates most of which ensured that previous iMovie and IDVD schemes coukd no longer be opened or used.
Since Apple does not inform users of such problems before the updates are  downloaded, maybe it will be of great benefit to  get
a reply from other users who have upgraded already to Mavericks.
So which apps, if any will no longer work, if the OS is upgraded to Mavericks?  

Answer 1

You were contacted by Apple to download Mavericks? Really?
We wouldn't be able to give you a blow by blow description of which apps will or will not work with Mavericks. There are a lot of people who have upgraded to Mavericks and are not having any issues whatsoever.
There are others who seem to be having every possible issue you can think of.
I would imagine that the difference in experiences here is due to the types of sofware people are running, the amount of CPU capacitity they are using to run various apps, games, etc. Whether or not they are running non-Apple applications, how often they have dropped their laptop, etc.
Since you seem concerned with messes, and problems, and losses of files, then unless you have some burning need to upgrade right at this very moment in it, it seem like it might be prudent to wait.
That's what I am doing. I am perfectly happy with Mountain Lion. There is nothing in Mavericks that I feel I can't live without for awhile. Eventually, I will be upgrading to Mavericks, because I don't want to fall behind in OSX levels for my machine. But for now, there is simply no pressing need to do so.
Bugs are being worked out. Fine tuning is being done. Enhancements are being made.
So, why rush into somehting that has been out for only two months....what's the hurry? It's not going anywhere anytime soon....
GB