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BRIEF ABOUT EXCHANGE/OUTLOOK OST FILES

What is OST file?


OST file is an Offline Storage table that enables users to work with their messages and email data even access to the mail server is not available.OST file contains all your messages, attachments, contacts, notes, and other information. OST file is generated when you lose connectivity with the Server but all the changes will be automatically synchronized to your mailbox when you get connectivity with Server.



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  1. Steps to create an OST file
  2. Benefits of OST file

How to create an OST file?


OST file works like a copy of PST file when a user loses connection with Server. All the changes you have made during the time will be updated to your Outlook mailbox. OST file becomes inaccessible when moving out of Outlook.

Follow the steps if you wish to create an OST file –

  • Go to File menu and select work offline mode.
  • OST is simply created when you lose connection with Server.
  • Now, select the mailbox folder for offline use. In order to select a particular folder, follow the steps given below –
    • Go to Tools Menu > Send/Receive > Send/Receive settings >Define Send/Receive groups
    • Click edit under Send/Receive groups
    • Select your exchange account
    • In the folders option, select the folders that you want to use offline

Benefits of OST file


With the OST file, a user performs normal tasks as he/she did in an online mode without a secure connection. It is the best and secure way to continue your work which will be updated when you get a connection with the server.

Why this conversion is required?

These are the reasons why a user needs the conversion–

  • This enables a user to migrate the data from one place to another. This is really very helpful in case of job switch when you want to move your important OST files.
  • By this conversion, it is possible to recover the data even after it is deleted from the Exchange server.
  • OST file will be inaccessible when you upgrade your operating system but PST will work.
  • If a user upgrades his/her Outlook, OST file can’t support at that time however, PST file will work.


Due to these reasons, the migration is suggested to the users that will help them to move their files from one place to another.


GainTools OST to PST Converter is an ideal tool that will complete the export task safely without any issues. The user can easily handle the tool without any technical issues. You can freely test the tool before taking its license. The tool performs proper working on all versions of Outlook.

Only three steps of working –

  • Browse your OST file
  • Choose the export type
  • Provide a location to save the results