🗃 OST Files
An OST file (.ost) is an offline folder file in Microsoft Outlook. Offline folders make it possible for the user to work offline and then to synchronize changes with the Exchange server the next time they connect.
In general, the following is stored in the ost-file:
- Your mailbox data (mail, calendar, contacts, tasks, notes and journal folders).
- Hidden items and other “overhead” as found in a pst-file.
- Public Folder Favorites.
- Shared folders of additional mailboxes linked to your Exchange account.
The best OST Files based on votes, our collection of reviews, verified products and a total of 6 factors.
Best OST Files in 2025
- Open-Source OST Files products
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/weeom-ost-repair-tool-alternatives
A secure solution to repair corrupted OST files.
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/shoviv-outlook-pst-recovery-tool-alternativesShoviv Outlook PST Recovery Tool helps to recover damaged and deleted PST files without any changes in the attributes and attachments.
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/systools-ost-recovery-alternativesOST Recovery software recover damaged OST files & restore OST messages from Outlook 2019, 2016, 2013, 2010, 2007, 2003. NST & OST Fix tool also recovers corrupt, orphaned or encrypted OST file emails created by Exchange Server or IMAP profiles.
Key SysTools OST Recovery features:
Comprehensive Recovery Multiple Export Options Batch Recovery User-Friendly Interface
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/datahelp-ost-repair-tool-alternativesDataHelp OST repair tool to recover permanently deleted OST file data in PST, EML, MSG, PDF, HTML & Office 365. With this tool, you can also repair corrupted OST file.
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/leitzcloud-alternativesSync and share your company documents.
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/sysoz-outlook-ost-recovery-alternativesSysOZ OST Recovery software is great Tool to repair the all OST file and gives users full power to recover and save recovered OST emails and mailbox items into multiple formats PST, EMLX, MBOX, vCard, vCal, Office 365, & Live Exchange Server.
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/trustvare-ost-converter-alternativesTo Export/convert OST files into Multiple file formats such as PST, EML, EMLX, MBOX, MSG, PDF, Office 365, etc, by TrustVare OST Converter Software. .
Key Trustvare OST Converter features:
Bulk Conversion Supports all Windows OS versions User-friendly and safe conversion Recover OST Files
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/pcloud-alternativesCloud storage service with up to 20GB for free! Store, share and send large files to anyone. Join now and have your files everywhere you go.
Key pCloud features:
Security Lifetime Plans File Versioning Media Playback
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/sync-com-alternativesSync. com offers a backup tool and a file sharing service, rolled into one.
Key Sync.com features:
Zero-Knowledge Encryption Privacy Compliance Generous Free Plan Affordable Pricing
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/recoverytools-for-exchange-ost-alternativesExchange OST recovery software is the best Exchange OST to PST converter program to recover Exchange OST files from corruption.
Key RecoveryTools for Exchange OST features:
User-Friendly Interface Comprehensive Recovery Multiple File Format Support Selective Item Recovery
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/dropbox-alternativesOnline Sync and File Sharing.
Key Dropbox features:
Ease of Use Cross-Platform Compatibility Collaboration Features File Versioning
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/enstella-ost-to-pst-recovery-alternativesEnstella OST to PST Recovery is an application for recovery of corrupted OST file and then convert into PST and many more formats.
Key Enstella OST to PST Recovery features:
User-Friendly Interface Multiple Conversion Options Selective Recovery Preview Feature
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/box-alternativesBox offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Key Box features:
Storage Capacity Collaboration Tools Security Features Integrations