1985-09-27 /SRI_NIC_PERM_SRC_3_19910112/01/mm-new/binaries/mmailbox.exe 1988-03-11 /k20v7c/01/tools/mmailbox.exe 1988-05-27 /bb-ev83b-bm/01/unsupported-subsys-utilities/mmailbox.exe 1988-05-27 /bb-ev83b-bm_longer/01/unsupported-subsys-utilities/mmailbox.exe 1988-05-27 /tops20_v7_0_tcpip_distribution_tape/01/unsupported-subsys-utilities/mmailbox.exe 1989-06-27 /SRI_NIC_PERM_SRC_3_19910112/01/mm-dom/mmailbox.exe