A NSW Government Department undertook a large infrastructure multiphase program to onboard/offboard a number of agency users (approx. 5000+ and 100+ apps) moving in/out of the department and ensuring users had access via their standardized collaborations tools (0365 suite etc) with their line of business applications. The program also included email/Enterprise Voice/SharePoint migration from different 0365 tenants to the departments 0365 tenant.  Included also was the GSuite migration to department O365 tenant. Other scope in the program included also upgraded SOE (Standard Operating System) upgrade from Windows 7 to Window 10 to existing and new devices.  TL Consulting were brought initially to setup a governance framework along with audit tracking and working with users and application teams to ensure the migration was successful with quality controls in place.  The team were also tasked with infrastructure discovery, executing infrastructure testing with vendors, department and agency network teams with Cross Connects being installed on different location sites with ongoing Network level Firewall changes or DNS changes or any related Proxy changes.  This validation also assisted in identifying the Integrations to Active Directory, SSO enabled applications or connectivity to the SaaS based Apps.  Validation testing of the connectivity was performed across different mediums such as Corporate Wifi, Corporate LAN, VPN and Guest Wifi.