What Is an OST File? Everything You Need to Know in 2026

[vMailsoftware]

An OST (Offline Storage Table) file is a Microsoft Outlook data file that stores a synchronized copy of your mailbox on your local computer. It is primarily used with Microsoft Exchange Server, Microsoft 365, and Outlook.com accounts, allowing users to access emails, contacts, calendars, tasks, and other mailbox items even when they are offline. Once the internet connection is restored, Outlook automatically syncs all changes with the mail server.

OST files improve productivity by enabling users to continue working without network interruptions. They also reduce dependency on constant internet access, making them ideal for business professionals who travel frequently. However, since an OST file is linked to a specific Outlook profile and Exchange account, it cannot be directly imported into another Outlook profile like a PST file.

Sometimes OST files become inaccessible due to profile corruption, Exchange server issues, accidental deletion, or Outlook errors. In such situations, converting the OST file into PST format becomes the most practical solution for accessing mailbox data independently.

If you need to recover inaccessible emails, migrate to another Outlook profile, or create a secure backup, using a professional OST to PST Converter ensures safe conversion while preserving emails, attachments, folder hierarchy, metadata, and formatting. It offers a reliable way to access valuable Outlook data without risking data loss.

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[adamsmith31]

OST and PST are two data files of Microsoft Outlook to store data including emails, contacts, calendars, notes, attachments, etc. In case you want to convert OST file to PST format then EmailsGuru OST to PST Converter is suitable solution. This tool does not only convert OST file to PST but also preserves all email data, attachments and original data integrity throughout the conversion process. It is best way to recover or access OST file data into Outlook 2019, 2016, 2013 and all below version. It is fully safe and easy thus any individuals or professionals can use this solution to convert OST file to PST.