We have upgraded our SharePoint farm from 2010 to 2013, after the upgrade is seeing duplicate user profiles in User Profile service application each user with domainname\username and other with domain: username.
I tried the deleting couple of accounts manually but those accounts popped up after a crawl.
currently, I can more than 18 thousand user profile in my farm.
which is not the case.
any help on this will be appreciated.