Support for synching contacts and calendars has been deprecated and will be removed in a future version of iTunes (after 12.13.13) What to do?

I use iTunes - Info - Sync Contacts - Windows Contacts to add contacts onto iPhones being issued to new staff. That way when they get a call from other staff, caller ID with display the contact name, or if they need to make a call to staff, they need to look no further that the contacts on the phone.

But an iTunes pop-up message says the ability to sync contacts will be removed from iTunes in a future version, and it's already NOT a feature in the "Apple Devices" app.

Any other suggestions about how I can load contact details onto new iPhones being issues to staff so they can see who's calling them?

Thanks.