Q: Calendar not syncing between windows 10 and Ipad/Iphone

Greetings ICR35,

Thanks for using the Apple Support Communities!

I understand that Calendar events are not syncing between your iOS device and your Windows computer. To begin troubleshooting this situation, I suggest reading over and working through the suggested steps located in the following article.

If you can't sync contacts and calendars using iTunes for Windows - Apple Support

Have a great day!