File Extension OST

By:   |   Updated: November 26, 2018

Microsoft Silver

OST File Summary

Our most recent information indicates that OST files are associated with only a single known file type, the Outlook Offline Data File format, and can be viewed primarily with Microsoft Outlook 2016, including four other known software applications (listed below). The majority of OST files are considered Uncommon Files.

OST files are found on both mobile and desktop platforms and can be opened using Windows, iOS, and Android operating systems. OST files have a "Low" Popularity Rating; this means that they are not present on most devices.

If you are having problems opening OST files, or would simply like to learn more about the software programs and developers that are associated with them, please see the complete information contained below.

Low
File Type Popularity
6834
Ranking

/ 11690

Active

Relevance

26

November

2018

Updated

Open OST Files with FileViewPro

Product by Solvusoft

Free Download

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Kinds of OST Files


Leading OST Type

.OST
File Ext:.ost
Type:Outlook Offline Data File

OST file extension refers to a data file that is created by the 2005 or later versions of Microsoft Outlook. Microsoft Outlook is a personal information and email client manager. OST files are used for storage of mailbox information from an Exchange, Office 365, or outlook.com account. The contents of these files include contacts, email messages, Calendar data, tasks, and other account information.

Developer: Microsoft Corporation
Division:Uncommon Files
Subkey: HKEY_CLASSES_ROOT\.ost

Software Programs That Open The Outlook Offline Data File:


Microsoft Outlook 2016 by Microsoft Corporation

Windows
Windows Phone
iOS
Android
OS X El Capitan

Remo Convert OST to PST by Remo Software

Windows

OEMailRecovery.com Outlook Recovery Toolbox by Microsoft Corporation

Windows

4Team Corporation OST PST Viewer by 4Team Corporation

Windows

Aryson OST Recovery by Aryson Technologies

Windows

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall


OST Requests


Popular OSes

Windows (97.14%)
Macintosh (2.06%)
Linux (0.73%)
Chrome (0.05%)
Other (0.01%)


Understanding OST Issues


Troubles Opening OST Files

Microsoft Outlook 2016 Isn't There

When trying to open your OST file, you get the error "Can't Open OST File Type". If this is the case, it's usually due to the fact that you do not have Microsoft Outlook 2016 for %%os%% installed on your computer. Your operating system cannot associate your OST with Microsoft Outlook 2016, so double-clicking the file won't work.


Tip: When you have another program installed that you know will open your OST, you can select it from the other programs listed (see "Show Apps").


Wrong Version of Microsoft Outlook 2016 is Installed

It is possible that your version of Microsoft Outlook 2016 isn't able to open your Outlook Offline Data File file due to incompatibility. If you do not have the proper version Microsoft Outlook 2016 (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. Your Outlook Offline Data File file was probably created by a newer release of Microsoft Outlook 2016 than what's currently installed your computer.


Tip: Find clues on the correct software version by right-clicking your OST file and clicking "Properties".


Ultimately, most of the difficulties opening OST files are due to having the wrong version of Microsoft Outlook 2016 installed.


Other Causes of OST File Opening Problems

In the majority of cases, installing the right version of Microsoft Outlook 2016 will resolve your issue. If you're still experiencing problems opening OST files, there could be other computer problems. Issues that aren't software-related:

  • File references in the Windows Registry for OST are wrong
  • Accidental deletion of the description of the OST file in the Windows registry
  • Invalid installation of a OST-associated program (eg. Microsoft Outlook 2016)
  • Your OST file is corrupted (issues with your Outlook Offline Data File file itself)
  • Your OST has adversely impacted by malware
  • Device drivers for OST-related hardware are out-of-date
  • Windows has inadequate resources to open your Outlook Offline Data File file

Quiz: How many characters long can a filename be?









Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall


File Extensions   # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

© Solvusoft Corporation 2011-2023. All Rights Reserved.