The Best Guide to Delete OST File

Jun 08, 2020 • Filed to: Recover & Repair Files • Proven solutions


Microsoft Outlook also known as MS Outlook, email client and personal information manager which comes with Microsoft Office. OST is the short form for Offline Storage Table which has been created by Microsoft Outlook. OST files stores all the offline work and whenever the Outlook goes online all the information gets updated online. The server is automatically synced regularly and you can work in offline mode. It helps you work when the network connection or server is very slow or vulnerable. In this post, we will tell you how to delete Ost files, reduce the size of ost file and recover them.

The best guide to delete ost file

Part 1. Step by step tutorial to delete damaged or corrupted .ost files

To delete ost file you must make sure that the MS outlook is closed.

Step 1. Now to delete ost file, click on the start button and then type ‘Run’ in the search bar. The Run program appears in the search list. Click on it to open it.

How to delete ost file-run

Step 2. Once you click on “Run”, the run window appears. Enter the address in the following format to locate the .ost file in your system as shown below.

C:UsersUser NameAppDataLocalMicrosoftOutlook

How to delete ost file-type format

Step 3. Once you click on ‘OK’, a new screen appears which opens up the file destination where the .ost file is present as shown below.

How to delete ost file-locate ost file

Step 4.To delete ost file, select the file by clicking on it and then press the ‘Delete’ button. A notification appears asking ‘Are you sure you want to delete the file?’ as shown below. Click on the ‘Yes’ option and the file gets deleted. Now you delete ost files succesfully on your computer. However, what if you don't want to delete ost file but reduce the size? On the part 2, we will decuss more.

How to delete ost file-confirm to delete .ost file

Part 2 Reducing the size of .ost file

Earlier versions of MS outlook had a predefined file size limit as 2GB, but fortunately from MS Outlook 2007 onwards the size limit has been increased to 20 GB. However it is necessary because your .ost files are from time to time so that the size does not become excessively large.

Size of the .ost file can be reduced with the help of Mailbox cleanup tool which is one of the features from MS Outlook.

  1. Once you open the MS Outlook, click on the ‘Tools’ menu and then click on the option ‘Mailbox cleanup’.
  2. To view the total size of your mailbox and the individual folders within it, click on ‘View Mailbox size’. A screen will appear after which shows you different folders and their sizes. To delete any folder click on the folder once and press the ‘Delete’ button.
  3. To delete files within a folder, open the folder by double clicking on it and the select the files you want to delete and finally press the ‘Delete’ button.
  4. Now again click on the ‘Tools’ menu and then click on ‘Account settings’.
  5. From the list that appears, click on the option ‘Microsoft Exchange Server’. A new menu appears.
  6. In the new menu click on ‘Change’ and then click on ‘More settings’ which further opens up a new screen.
  7. Click on the ‘Advanced’ tab in the new screen, and then click on ‘Offline Folder File Settings’.
  8. After clicking on the ‘Offline Folder File Settings’ a new screen appears. In this new menu click on the option ‘Compact now’.
  9. Your .ost files starts to compress and the size of the file is reduced.

Part 3. Deleted .ost files accidently? Here is a way to recover .ost files

If you delete ost. files by accident, then we will need to restor them with the help of data recovery tools. Here is a quick guide to recover deleted or lost .ost file.

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Step 1 Free download and install Recoverit file recovery on your computer. Launch it and select a data recovery mode, please select "Deleted Files Recovery" mode to help you retrieve deleted .OST files.

how to recover deleted ost files-select deleted files recovery mode to start

Step 2 Please select a location where your lost your data and click on "Start" button to scanning lost ost files.

how to recover deleted ost files-select a disk to finding data

Step 3 It will start a quick scan to search your lost .ost files, you can simply preview some recoverable files. If you cannot find your files, you can go to scan agian with "All-Around Recovery" mode to search more files. While it will take more time than quick scan.

how to recover deleted ost files-scan with all-around recovery

Step 4 Once the search has been completed the list of all deleted .ost, .pst etc. files appears in the screen. Select the .ost file which you want to save and then click on the "Recover" option present at the bottom.

recover deleted ost file recovery

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Amy Dennis

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