Full disclosure: I ran manjaro as a daily driver for a while a few years back bad have been forced back on windows as well by company policy. So I’m not going to be the ultimate authority to answer your questions.
All I wanted to comment is that with iTunes and Office you have picked two pieces of software by two companies that have a very strong interest in not letting you migrate away from them. I tried to migrate my gf’s password manager from the iCloud one to bitwarden and it’s amazing the hoops they make you jump through to get at your data. So what you might be experiencing right now is a thing called “vendor lock”, and I wish you the best of luck for finding a way out. ;)