OS: SLES10 SP3
GW: 8.0.2

its a single Domain/PO/MTA installation of GW8.0.2 on SLES10SP3.
All the components are installed on single server.

from the GW server system machine
ConsoleOne > GW System > Tools > "Mailbox/Library Maintenance"
but "Mailbox/Library Maintenance" is disabled/dimmed

Its a home work type question, I am exploring/learning GW
please help