When i search for Firebird Delphi group on google Firebird support answers are listed so i guess firebird-support remains de facto listed group https://www.google.com/search?q=Firebird+delphi+group+site:groups.yahoo.com https://www.google.com/search?q=Firebird+delphi+group+site:groups.yahoo.com
for Firebird+Delphi related answers Also there are various forums at embarcadero/lazarus I guess if is not used for so many years , you can drop it i guess Only if you don't want to move Firebird delphi related discussions there ;)
