Anyone else get this message when starting iTunes for Windows as of 26 April 2021?

You will see it in iTunes 12.11.3.17 if you currently sync your contacts or calendars using iTunes. It isn't clear when this removal will take place, but if you don't want to switch to iCloud for Windows to sync your contacts and calendars then you will likely want to decline future updates to iTunes.

tt2

I use a tool called CopyTrans Contacts for replacing iTunes. So, I'm able to sync contacts and calendars and the app is much easier than I thought. Only glitch I saw involved saving notes off iPhone: some of the iOS versions have a problem. But in general, the tool works well for me.