Retention is configured to your approved policy for each record type, which is often seven years or longer. Microsoft 365 email, files and Teams are held in immutable, encrypted backup with retention set per your file-retention policy, including the longer or indefinite holds firms apply to wills, deeds, probate and conveyancing files. That means closed matter correspondence can still be produced years later for a complaint, an insurer or the SRA, and we test restores so the answer is evidenced rather than hoped for.