To date, the Army has migrated 500,000 email accounts to the cloud, according to a news release. The Army expects to move a total of 1.6 million email users from disparate local servers to centralized servers operated by the Defense Information Systems Agency by March 2013. The Army projects the move, which began January 2011, will save $380 million through fiscal year 2017. The migration hasn’t come without challenges, delays and much scrutiny. The Army was forced to suspend the migration in December after concerned lawmakers temporarily withheld funding for the program, pending a detailed review. About 520,000 people across the Defense Department, including the Joint…