After watching 15 crashing notices in a row, spent over an hour with Apple Care on the phone...then finding many new solutions to non-existent problems and other issues...I sent it back to Apple after two weeks...iTunes is now dead....and the process of dragging music from the mac to the iPhone is now much more complicated and slow....Apple Geeks decided there was nothing wrong with iTunes...lets delete it and replace it with “Music” and make it much more difficult to do simple tasks.....how about the “notifications” new addition...so when you get a new daily email from PCH sweepstakes and other spam...it can disrupt you by posting on the desktop. Sure hope everyone using BigSur loves this new feature. I replaced a mac mini 2011 running 10.3.6 and I am back to using it...BEWARE...I have been a Mac user since my Powerbook 150 and Apple has lost their way.....My BEAN simple word processing does not work on Big Sur and all the documents I made were not usable with BigSur....as well as other apps. ITs hard to believe that this OS or this Mac was truly tested before putting it out for users....Apple Sr. Advisor frustrated with this mini said...lets re-install the OS.....we tried....and it failed...that was it for me.