Home » How to Reduce the OST File Size? Step-by-Step Guide

How to Reduce the OST File Size? Step-by-Step Guide

by Uneeb Khan
Reduce the OST File Size

An offline data file (OST) is a ditto clone of the Exchange Server. The OST file contains storage for Outlook mailbox data. It syncs with the exchange server and creates an online data file called PST. A user can delete or read the emails even when they are offline. When an account user is working online, the Exchange server syncs with his or her Outlook client. 365 بث مباشر The edited file is saved as an OST file format, and it is saved when you go online. After using Outlook for a long time, the period comes when the storage of OST files is full, and now it is creating problems like hanging Outlook, bugs, not opening, etc. To save themselves from these frustrating errors, users need to maintain the OST data files to reduce the chances of failure. So let’s continue with the question of how to reduce the OST file size.

Prolongation of the OST File Size

In Outlook, the OST file stores all the data for the mailbox, like emails, contacts, notes, calendars, tasks, etc. The OST size depends on the amount and size of your mailbox data. The regular maintenance of the offline storage file will help decrease the chances of errors in Outlook. The following points will explain the ways to reduce the OST file size.

  • By deleting undesirable emails from your inbox on a regular basis.
  • To downsize the size of the offline folder files, empty the deleted items folders like Trash and Spam (.ost).
  • If data items need to be removed from the mailbox, perform a hard deletion.
  • Make sure that mailbox folders are compacted on a regular basis.

How to Reduce the OST File Size in Outlook?

Outlook has a unique function to lower the size of OST files by compacting them. This process helps users reduce the size of offline storage files and make space for new OST files. This manual method has no restriction on how many times an OST can be compressed. For a better experience with Microsoft Outlook, make sure you compress the OST files at least twice a year. Let’s climb to the steps of reducing OST file size. امريكا اكسبرس

  • Begin the process by removing any items that are no longer in use, do not need to be compressed, or are saved in the mailbox.
  • Use Ctrl+6 keys to get the folder list view that is required.
  • Delete all the items and right-click on them to empty the folder.
  • Open File > Account Settings > Account Settings from the drop-down menu.
  • Now, click on the Data File Tab, and select the highlighted OST file.
  • Then open Settings from the drop-down menu.
  • Click on the Advanced tab in the Settings box and select Outlook Data File Settings. ملاعب كاس العالم 2022
  • Now, click on the compact now button and then OK.

A Verified Solution to Lower the OST File Size.

Unfortunately, the manual method won’t give you the result that you were expecting. It is difficult to handle the storage space of an OST file. It happens when users have no files for deletion, all the mailbox data is important, and they want to manage the storage space. This time, we will advise users to use the instant and top-rated Outlook OST Splitter software to prevent their Outlook from unbearable errors. It can split an OST file into numerous sections based on size, date, year, and folder. It splits data from an offline file and saves it in the PST file format, also known as a personal storage file.


In conclusion, the size of an OST file has exceeded the limit given in Microsoft Outlook. And the issues arise from here. Lots of users are facing the same problem of an error in the Outlook application while working. The errors are hangs, corruption, problems in the opening, bugs, etc. In this article, we solve this problem by reducing the OST file size using a step-by-step guide. We also describe the alternated method to resolve this problem. Use OST splitter software and make your task easier and more effective to reduce the OST file size.

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