Apologies for dumb question. We raised our domain functional level from Server 2003 to Server 2008 R2 a few months ago, but completely overlooked the forest functional level, which is still at 2003. We only have the one domain though, so is there any issue with raising the forest level that I should be aware of?
Background... Being overly paranoid here. Prior to introducing our first Server 2016 DC, we had to raise our domain functional level as it was still on Server 2003 and we were still using FRS for Sysvol and replication. We had long-since decommissioned our last Server 2003-based DCs. No replication errors showed up at the time. But when I raised the domain functional level from 2003 to 2008 R2, that caused all user passwords in our domain to expire. That was not a good day. As it turns out, there was a fine grained password policy in place that for some reason took precedence over our default domain policy when I raised the domain functional level. I've since removed the FGP as it should never have been there and things seem OK so far. But as I say, now I'm a bit paranoid, as I had been reading up on raising the domain functional level and couldn't find anything that would suggest that would happen. We used to have Exchange years ago but switched to Gmail. We do have some basic Azure AD connectivity.
Thanks,
Syd