PostgreSql and Caldera

Why does there exist a binary rpm for Caldera eServer
2.3 but not for
Caldera 2.3 edesktop or 2.4 edesktop. I want to install
on edesktop.
What are the differences and problems.
I had read on the PostgreSQL site not to install eserver
rpm on the
edesktop,
  "as there are differences"
I called Caldera Tech they say "I dunno..."
I called GreatBridge and  they say "I dunno.."
Well I dunno either..
 I would greatly appreciate if someone would
articulate..   ; > )

.............The OS/2 install of PosgreSQL was a piece
of pie
..............

Bob T