The Defense Information Systems Agency (DISA) is seeking sources for Defense Enterprise Office Solution (DEOS) Department of Defense (DoD) Office 365 Operations and Maintenance. This requirement will ... The Defense Information Systems Agency (DISA) is seeking sources for Defense Enterprise Office Solution (DEOS) Department of Defense (DoD) Office 365 Operations and Maintenance. This requirement will support DISA Portfolio Acquisition Executive Services (PAE Services) (SD), Enterprise Collaboration Services Division (SD3). See attached Sources Sought Notice for details.