I migrated our environment from a single DC server 2003 to a single DC server 2012 R2.  I followed the migration process that is documented by Microsoft and others.

However, I forgot to assign my account Enterprise Admin and Schema Admin before raising the domain and forest levels from 2003 to 2012 R2.  My account did have domain admin.  The GUI interface did not complain when I raised the level of the domain and then the forest.

So I am thinking everything is OK.

My question is am I going to have problems down the road with the AD environment?

Thanks for any help or opinions.

Use dignostics tools to check the health of your system. Are thgere any errors or warnings in Event logs.

If you have a good backup of original system there is return path for you in the case when something is not repairable.

Regards

Milos

By default, a domain admin in the root domain, or single forest/single domain can add him self to enterprise admin.