This architecture works seamlessly until disaster strikes. If a server crashes, if a company goes out of business, or if an employee leaves and their account is deleted, the OST file remains on the user's hard drive—but it becomes "orphaned." Outlook can no longer open it because the "key" (the server profile) is gone. Native Microsoft tools often offer no solution for this scenario, leaving gigabytes of critical emails, contacts, and calendar entries trapped in a digital vault that refuses to open.