iTunes duplicates Outlook contacts when syncing with iPad

Hi all

After the recent upgrade to a newer laptop I faced a problem with syncing Outlook contacts. I was using iTunes for years and everything worked fine. But this time iTunes duplicates contacts in my iPad each time I try to sync changes.

That's not an iPad problem as my old laptop works fine with everything. I guess that's something wrong with my new laptop or Windows 10 that breaks syncing. Is there any workaround in my situation?

 

I didn’t succeed in finding a reason why iTunes duplicates my addressbook but I found this solution:
http://www.akruto.com/sync-iphone-with-outlook/
I’ve been testing it for a few days and it looks promising. But I'm still interested in making iTunes work properly so if you know how to fix it I’ll be grateful for you help.