Also, the rest of the federal government has terrible IT infrastructure, and the previous Secretaries also had many problems, so we can't really fault the current Department of State with malfeasance. No, best to just move on and pretend nothing happened.
From the report cover:
"As is the case throughout the Federal Government, management weaknesses at the Department have contributed to the loss or removal of email records, particularly records created by the Office of the Secretary. These weaknesses include a limited ability to retrieve email records, inaccessibility of electronic files, failure to comply with requirements for departing employees, and a general lack of oversight.
OIG’s ability to evaluate the Office of the Secretary’s compliance with policies regarding records preservation and use of non-Departmental communications systems was, at times, hampered by these weaknesses. However, based on its review of records, questionnaires, and interviews, OIG determined that email usage and preservation practices varied across the tenures of the five most recent Secretaries and that, accordingly, compliance with statutory, regulatory, and internal requirements varied as well."