OST File Extension

OST file extension is created by Microsoft, also known as Outlook Offline Data File. OST has been classified as Misc Files. This File type categories under Zip, Text, Binary and XML, however, the format of this file format has not been determined yet. You can open OST files in Microsoft Outlook program.

Outlook Offline Data File Type

What is a OST File Type?

The OST files are stored on the local computer; a user, allowing the user to access his/her e-mails and d' other information on the mailbox when he/she does not have access to the Internet. Users can search for and create appointments-you, search for or add contacts, and read and write e-mails when they are offline. Any changes made offline, however, will not be synchronized with the user account on the server until such time as an Internet connection is re-established.

When the option " Use Offline Folders & is selected, an OST file is created. The file will be located in the following directory:

Users\ User\ AppData\ Local\ Microsoft\ Outlook.

You can also go to the location of the OST file by selecting File & Field; Rarr; Account Settings, by clicking Account Settings..., by selecting the 'Data Files tab, by clicking on an entry, and then selecting Open Folder.

The OST file is similar to a personal file (.PST) but n' used only to store data offline.

Free online OST Tools & Apps

We have also the free online .OST (Outlook Offline Data File) file extension apps that can allow to view, edit, convert from to OST, merge, split and compare the OST files without installing anything on your system. Please click on the links to explore the complete list of details for each required feature.

OST Converter

Open OST

Edit OST

Compare OST Files

Merge OST Files

Split OST Files

OST Metadata Viewer

OST Files Common Issues

There are few common issues with the Outlook Offline Data File .OST File Extensions while opening the .OST files on Windows and MacOs, we have solution to those issues such as:

Can't Open OST Files?

1. You must have supported software programs installed for Outlook Offline Data File on your system such as Microsoft Outlook.
2. Associate default Microsoft Microsoft Outlook program for *.ost (Outlook Offline Data File) files.
   
   

   Associate OST Default Program on Windows

   1. Right-click a *.OST (e.g example.ost) file and click Open With.
   2. In the Open with dialog box, click Microsoft Microsoft Outlook program Or click Browse to locate the program (*.exe) that you want.
   3. Select check box for Always use this app to open .ost files.
   
   

   Associate OST Default Program on MacOs

   1. Click *.OST (e.g example.ost) file and click information -> Open With.
   2. In the programs list, click Microsoft Microsoft Outlook program Or other appropriate program that you want.
   3. Confirm Change for all... and Contine.
   4. A message will appear "This change will be applied to all files with .Microsoft Outlook extension. By clicking Continue you confirm your selection", click Contine to apply changes.

Related OST File Extensions

OST default file extension is .OST and other similer related extensions are:

All Platform Software Programs for OST File Extension

List of all softwares that can open the OST files on each platforms such as Windows, Mac, iOS, Linux, Web and Android, you may click the each software link for more details for other supported formats for each software and the verified direct download links for each software with complete lisensing details.

Open OST File on Windows

	Software	License	Developer
	Aspose Aspose.Total for .NET 16.3.0 for Windows	Commercial	Aspose
	osu! 000 for Windows	Free	osu!
	Microsoft Outlook 365 for Windows	Commercial	Microsoft

Open OST File on Mac OS

	Software	License	Developer
	Microsoft Outlook 365 for MacOs	Commercial	Microsoft

Open OST file on Linux

Open OST file on Web

Open OST file on iOS

Open OST file on Android

About Licensing

1. Free Trial This software are often used for an attempt period, like 14 days, before requiring payment. Some trial versions have a reduced feature set.
2. Free This software is liberal to use. Examples include open-source , freeware software, like free programs supported by advertising.
3. Free⁺ This software is liberal to download and use, but contains in-app purchases (IAP) to unlock additional content or functionality.
4. Paid This software must be purchased so as to use it. it's going to be offered as a perpetual license or ongoing subscription.
5. Included with OS This software is bundled with an OS , like Windows, macOS, or Android.

About OST - Outlook Offline Data File

Listed file converters are from the wide range of online file converter.

These are the most polular file/document converters based on the user's review and usage on the FileProInfo.