Step-by-Step Guide: Active Directory Migration from Windows Server 2008 R2 to Windows Server 2022

Great guide. There is more to add:

- use Server Core Installation Option for your new Server. You don't need a GUI. Thank me later. 

- don't run other roles but ADDS and DNS on this VM. 

- you no longer need hardware ADDS. Not even for modern Cluster Services.

- update your DFS level, configure and use FQDN only

- consider to avoid SMB1 use (basically only needed if have pre 2008 / Vista connections to sysvol. 

- don't forget to upgrade your DNS forward and reverse zones to support lastest version. Many will be still in 2000 Mode.

- check your site and services and mirror all networks in DNS reverse lookup zones 

- consider DNS secure updates only

- consider DHCP proxy updates for Linux, MFPs and other OSes

- consider ADBA and VAMT (ADK) over KMS host

- make yourself familiar to use Active Directory Administrative Center (DSAC), Server Manager and Windows Admin Center

- avoid RDP and local login to ADDS Servers

- get rid of login scripts where possible, replace by GPOs 

- migrate off old ADM based GPOs

- backup and update ADMX templates regularly

 - consider to use the lastest AD functional level and forest level if possible

- activate AD recycle bin 

- cleanup old dfs and ADCS remains

- change passwords of all critical Accounts (could be same password) after upgrading the AD level to 2008R2 or later use a more secure hash for the password. 

And many more...