hello all,
First of all, as already said here, 11 is very similar to 10. A few things have changed, mainly the start menu, the taskbar, and definitely the Settings App. However, nothing is going to stop you from being as productive as before, as long as you are open to learning how to do certain things differently.
Two more things:
1. Adobe Reader is definitely not the only pdf handler. It's always been a real pain! I stopped using it years ago and never looked back. If the person having problems is interested, we can of course talk more about this in private, I don't want to clutter the forum.
2. On certain computers including mine, there's an important memory leak in File Explorer. So if you've updated to Windows 11 and going through your files and folders feels very slow, it means you are affected by it. Only Microsoft can fix this in future updates. The alternatives are either putting up with this slowness and restarting your computer more often, or using another file manager until a fix comes, which is what I am doing.
Hope this info helps, warm regards!