How to Reduce Outlook OST File Size

How To Reduce Outlook OST File Size?

Heavy-sized OST files can create problems in Outlook functioning or your computer. For handling this problem it is necessary to reduce the size of the large size OST files. But what is the technique to “decrease the size of Outlook data files?” is a question of almost every Outlook user. With this blog post, we going to discuss this topic to know answer to How To Reduce Outlook OST File Size?

With the increased use of the Internet and technology, every user prefers using digital devices to do every task. But at a time many users face the problem of lower size storage or large files on their computer. Due to large files, the computer becomes very slow to perform any task. Sometimes this file size-increasing issue can become a serious problem for users.

MS Outlook is an email client that users of large enterprises, as well as home users, use for sending receiving emails. After doing each task Outlook saves a copy of every sent and received item. In addition to emailing process users also use this application to manage their contacts, and calendar entries. To save all information Outlook uses data files like PST and OST files. But storing all information of user’s mailboxes the size of OST file becomes larger. A huge-sized OST file can be a reason for many corruption errors and other problems in Outlook, that’s why users require a solution to reduce OST file size.

Also Read:- How to Open OST File Without Outlook?

What are the methods to Reduce Outlook OST File Size?

The increased size of Outlook data file OST can be a reason for unwanted problems in Outlook application. some techniques are available that an Outlook user can try to easily reduce OST files, but best in all of them is archiving function of Outlook. If you have an OST file that is connected with a server or in a running state this method is perfect for you.

  1. Open Outlook then Click on File >> Info >> Cleanup Tools >> Archive
  2. Now click on Archive this folder and all subfolders and subfolder and select the required folders from the OST mailbox.
  3. In the Archive items older than choose a date and choose a location to save the archive file by hitting on Browse button and then click on OK to start archiving process.

By archiving users can easily transfer some of the data from OST file to several PST files to manage data from Outlook OST files. Users can save the OST file items for the future with these PST files and they again import this PST file in Outlook to view data with no problem.

For a working OST file, this method is good but what to do if we have OST files in a corrupt or inaccessible state. In the next section, we will provide you the solution for this.

Reduce Outlook OST File Size Using Automated Tool

Making a corrupt OST file again accessible is not easy because while opening OST file Outlook is unable data of this file. If the reason for this Outlook error size problem of OST file it becomes very difficult for the user to solve this problem. For user ease Here is Passfixer OST Converter /Recovery Software, which also helps you to reduce the size of large OST files with a simple process.

User can easily add and select OST files in bulk by this software to easily repair OST and convert them into multiple formats. For reducing OST file size users can try the split function of this software. The split function of this software has the power to divide data of a large-sized OST file into multiple small PST files in simple clicks.

Steps to Reduce OST file size With Passfixer OST Converter:-

  • Launch PassFixer OST Converter Software on your machine.
  • From the firsct screen of the software choose Add single OST file or Add multiple OST file (batch) to load OST files. Select the OST file from its location and click on Next.
select source file
  • Load all OST files and start scanning process to load all mailbox items.
scan/load OST file
  • Preview mailbox componentes individually of OST files and select the required folders then hit on Convert.
scan/load OST file
  • Now choose Export to PST from conversion options and select Split PST option and set size range.
OST Conversion options
  • Select the destination path to save resulted files and click on Convert button to start the conversion.
Convert OST to PST

After conversion completion of OST to PST users will get multiple small-sized PST files on their selected location saving location. Users can easily transfer to another location or use the only required PST file to manage space in their drive and using Outook without getting any kind of problem.


Here in this blog, we have discussed some get options that are available for users to Reduce Outlook OST File Size. To manage the size of a large OST file that is in a healthy state is easy. But if a corruption error enters in Outlook because of Oversized OST files it becomes very difficult for user to resolve this problem and reducing the size of OST files. For this case, we have provided the best tool in the above section of this blog called OST Converter. Users can take advantage of this application to reduce OST file size and solve the corruption problem of OST files. To know more download its demo version.

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