.OST File Overview

File Extension:	OST
File Type Description:	Outlook Offline Data File
File Type Developer:	Microsoft Corporation
Primary Associated Software:	Microsoft Outlook 2016
Primary Software Developer:	Microsoft Corporation

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Home File Types Uncommon Files OST

What is File Extension OST?

Primarily, a OST file extension is a type of Outlook Offline Data File file developed for the Microsoft Outlook 2016 software program by Microsoft Corporation. Website visitor analysis indicates that OST files are commonly found on Windows 10 user machines, and are most popular in Romania. Frequently these users are visiting our web site using Google Chrome.

Associated Developers and Software

	Remo Convert OST to PST by Remo Software
	Microsoft Outlook 2016 by Microsoft Corporation
	OEMailRecovery.com Outlook Recovery Toolbox by Microsoft Corporation
	4Team Corporation OST PST Viewer by 4Team Corporation
	Aryson OST Recovery by Aryson Technologies

Top OST User Languages

Top OST File User Browsers

Desktop Friendly?

Mobile Friendly?

Top User Operating Systems


Windows 10	Windows 11	Windows 6	Windows 8.1

Associated Operating Systems

	Windows
	iOS
	Android
	Windows Phone
	OS X El Capitan

Other File Types Related to OST Files

Extension	File Type Developer	File Category	File Type Description
.OFX	Intuit, Inc.	Data Files	Open Financial Exchange File
.CHESSTITANSSAVE-MS	Microsoft Corporation	Game Files	Chess Titans Saved Game
.FLG	Larry Short, Mick Amadio and Puppy community	System Files	Puppy Linux Partition Flag File
.RTF	Microsoft Corporation	Text Files	Rich Text Format File
.THEME	Microsoft Corporation	System Files	Microsoft Plus! Desktop Theme
.XSB	Microsoft Corporation	Audio Files	XACT Sound Bank
.WAF	Microsoft Corporation	Temporary Files	Internet Explorer For Mac Cache
.CF	Proofpoint, Inc.	Settings Files	Sendmail Configuration File
.PBK	Microsoft Corporation	Data Files	Dial-Up Phone Book File
.SP1	Microsoft Corporation	Data Files	Microsoft Windows XP With Service Pack 1 Installation Data