I have couple of servers 50 servers as 2003 and 50 others as 2008
Most of servers have -( windows server 2003 and installed on it server exchange 2010 and Microsoft sql server 2005 and apps) and
( Microsoft sql server 2008 and windows servers sql 2012 and windows server 2008 and apps)
while servers 2003 has some apps installed on Microsoft sql server sql server 2005 and act as additional domain controller while server 2008 has Fsmo roles, Group policy management ,DFs,File server,Vpn and remote connectivity and terminal servers and Active directory,Dhcp.Dns.Nps,Printer server and HA roles.
Goal to upgrade to windows server 2016 and Migrate all windows servers 2003,2008 to windows server 2019 as windows servers 2008 include all Fsm roles,as well (all exchange 2010 on 2003 and 2008 to exchange 2019 on server 2019 )and (all (windows server 2005 ,on server 2003 to Ms sql server 2019 on windows server 2019 ) and( Ms sql 2008 and Ms sql 2012 on windows server 2008) to ----> ( MSSQL SERVER 2019 on windows servers 2019)