I have a single domain with AD running on a Server 2008 R2 virtual machine but at a Windows 2000 functional level (because that's what it was 20 years ago when we first created it). Now I'd like to sync my on-premise AD with Azure AD using the free service, so I need to raise the AD level. All our servers are either Server 2008 R2, Server 2012 or Server 2016 with the exception of one older machine (only used for DHCP at this point) that's running Server 2003.
Right-clicking my domain in Active Directory shows that I can Raise it as high as Server 2008. Is there any downside to doing this or any "gotchas" that I need to be aware of?
Art Cabot Director, Information Technology Sizemore, Inc.