Forum Discussion
Upgrade user profile service from SharePoint 2013 to SharePoint 2016
You've got the upgrade path down pat.
For what you lose with AD Import, here's the laudry list of stuff that doesn't work or has different behavior - https://technet.microsoft.com/EN-US/library/jj219646.aspx (more at https://blogs.msdn.microsoft.com/spses/2015/03/04/sharepoint-2013-active-directory-import-and-known-behaviors/).
You can still import custom attributes.
For MIM, you want to upgrade the UPSA databases first, as MIM will need an active UPSA in order to function. As for the URL, you point MIM at the Central Administration URL. I've also blogged about this at https://thesharepointfarm.com/microsoft-identity-manager-series/.
I'm sorry to push this one year old topic to the top but maybe someone could state on the fact that there's no "official" upgrade path from UPS 2013 to UPS 2016, if you stick to https://technet.microsoft.com/en-us/library/jj839719(v=office.16).aspx.
Can anybody tell me why it is like that? For the previous version step the description about upgrading UPS from 2010 to 2013 was included in the article.