A free a2zMigrations OST to PST converter is a valuable tool for individuals and businesses relying on Microsoft Outlook. OST (Offline Storage Table) files are a crucial component of Outlook, allowing users to work offline and synchronize their changes with the Exchange server when they reconnect to the internet. However, there are instances when you might need to convert OST files to PST (Personal Storage Table) format, which is more versatile and universally compatible across various email clients.