.OST File

File extension: OST

File type: Offline Cache

Do you have OST - related issues?
First check your registry for hidden errors.

Notes about the OST file extension:

Errors in your registry are one of the common causes for incorrect file associations on your windows system. It is highly recommended that you check your registry for file association errors (will also check for any other registry errors).

The OST file type is primarily associated with 'Exchange' by Microsoft Corporation.

Detailed information for file extension OST:

Primary association: Exchange

Company: Microsoft Corporation

Identifying characters Hex: 21 42 44 4E , ASCII: !BDN

Program ID: OSTFile , WEBFile

Other applications associated with file type OST:

On-Screen Takeoff (Project) by On Center Software, Inc.On-Screen Takeoff is software used in creating takeoffs from digital and paper plans.
Outlook (Offline Storage File) by Microsoft CorporationThe .PST file has a 2GB file size limit. When approaching the 2GB limit, if Office SP-1 is not installed, Outlook becomes extremely unstable to the point of not being able to clicking on any message, folder, etc. without locking Outlook. This includes attempting to access an .OST file. To shrink the file, delete items from their folders and then clear the Deleted Items folder using Tools | Empty Deleted Items Folder. Outlook will compress the folder in the background while the computer is idle so you may not see a size decrease immediately. The identifying characters used for this association are - Hex: 21 42 44 4E , ASCII: !BDNProgram ID: OSTFile , WEBFile Related links: MS Knowledge Base Article
Tivoli Storage Manager (File) by IBMThe IBM Tivoli Storage Manager family of offerings is designed to provide centralized, automated data protection that can help reduce the risks associated with data loss.

'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database

Important: When encountering any file extension issues it is always recommended that you run a free scan for Windows registry errors.

Technical data

To view technical data on file-extension OST click this link to expand/hide the additional area.

System Info for File Extension .OST

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: OSTFile, FileType: Office Data File

ProgramID: webfile, AppName: Dreamweaver MX

ProgramID: WEBFile, FileType: Office Data File

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Did you know

Everytime you install & uninstall software and modify system components your Windows registry is left fragmented with obsolete, corrupted and harmful files.

We recommend you run a free registry scan to identify the issues causing problems on your PC:

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