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.OST File Extension

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File TypeOutlook Offline Folder File

DeveloperMicrosoft
Popularity
3.1 (20 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
FormatBinary

Binary

This file is saved in a binary format, which requires a specific program to read its contents.

Definition

Stores e-mail messages and other data saved by Microsoft Outlook (2005 or later) from an Exchange server; similar to a Personal Folder (.PST) File, but supports larger file sizes.

More Information

OST files are created when the "Use Offline Folders" option is selected in Outlook and are stored on the local hard drive instead of mail server.

Programs that open OST files
Windows
Microsoft Outlook 2016
Remo Convert OST to PST
OEMailRecovery.com Outlook Recovery Toolbox
Updated 9/18/2015

FileInfo - The File Extensions Database

This page contains information about the .OST extension and its known file associations. Our goal is to help you understand what an OST file is and how to open it.

The Outlook Offline Folder file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and therefore do not publish any information we have not verified.

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