Why OST File Bigger Than Mailbox Size & What Is Solution ?

Rollins Duke   
Published: May 13th, 2024 • 5 Min Read


Summary: Here in this blog post we have briefly discussed about why OST file bigger than mailbox size. Stay tuned with us and read complete blog to know about how to tackle this issue. So, let’s get started.

The increasing size of Microsoft Outlook (OST) is obvious because of its substantial use in various organizations for emailing purposes. The size of OST files does not reduce so much even after erasing or deleting these email items. In fact, archiving method does not help much in this scenario. Sometimes this leads to an error i.e., an OST file bigger than mailbox size. Now the question arises that is there any solution available for this issue? The answer is absolute “Yes”.

There are multiple ways to accomplish this task. In this blog, we will share the manual as well as an automated method to fix the OST file too large error.

What are the techniques to resolve the error?

  1. Manual Solution
  2. Technical Solution

Manual Solution for OST file larger than mailbox size

Method 1: Manage the size of Outlook’s Mailbox

For this purpose, users can take the help of the Mailbox-cleanup tool for viewing the size of the entire Microsoft Outlook Mailbox. With the help of this, users can see the size of the particular folder which they want to. Users can also archive the older emails to an archive Outlook data file & after this, they can easily empty the folders of the deleted – items.

Now, follow the steps to manage the size of the mailbox of the Outlook data file.

  1. Firstly, users have to click on the File tab
  2. Now, click on Tools & then click on Mailbox Cleanup
  3. Thereafter, follow any of these mentioned steps:
  4. Finally for viewing the size of the entire mailbox and of an individual folder, click on the view mailbox size.

If users wish to find the older email items, then follow these steps:

  1. First, select items to find older than x, which is the required values days
  2. After that, enter a number between 1 & 999
  3. Then, click on the Find button
  4. Now, users have to choose to find items bigger than X KB
  5. Then after that, type in a number between 1 & 9999
  6. Finally, tap on the Find button

For importing older items into the mailbox to an archive Outlook -Data – File, then click on the Auto Archive.

This is the manual method for fixing the issue of Outlook OST file size not reducing after archiving error. But the main thing is for performing this method user needs a technical background. Without having any technical assistance user will not be able to perform this task. This method is too lengthy as well as hard. There is also a chance of losing important data. Hence, using an alternate method is best for users.

The technical solution for OST file much larger than mailbox

Users can easily solve the following issue with the help of  OST Splitter Software. This tool is especially made for solving the issue of OST file bigger than mailbox size.

The amazing application is an efficient solution for all users. It always keeps the data safe and secure. Also, users will not have to face any data loss. Users can directly fulfill this task with the help of the mentioned tool. There is also no file size limitation for the files which user wants to convert. This is a perfect software which permits to solve the issue of OST file much larger than mailbox in a couple of moments.

Download for Windows Download for Mac

This program also provides very lightweight service features and an uncluttered user interface that helps users in processing files in a very short time. It is currently the simplest and most effective free solution.

How to solve OST file bigger than mailbox size – Steps

Follow the below-mentioned steps for completing the task effectively without any hassle:

  1. Install the suggested toolkit on your Windows or Mac OS PC and read the instructions.
  2. Choose one option from Select Files or Select Folders for uploading oversized OST files.
    Select Files or Select Folders
  3. After inserting *.ost file in the software panel, you can see all folders, select required folders and press the Next button.
    select required folder
  4. Now software is giving the freedom to choose the size of Outlook data file i.e., 2 GB, 5 GB, and 10 GB. Browse destination path and click on Convert button.
    size of Outlook data file
  5. Now is creating new data files from oversized OST file, you can see the live process.
    ost file much larger than mailbox
  6. Task completed successfully, now hit on the Ok button for your confirmation.
    ost file too large error
  7. After that, it will automatically open the destination path. Not you can get output data in PST format.
    destination path
  8. At last, run Microsoft Outlook and import resultant files in Outlook. Your problem will be solved.
    run Microsoft Outlook

Concluding Lines

In the above blog, we have briefly discussed about OST file bigger than mailbox size. We must say that using an appropriate solution makes it easy to perform the task of OST file too large error. Here, we have mentioned the best accurate solution in this blog for our users. Also, all the information regarding tool has been mentioned above in this blog. We hope after reading this blog users will not have to face any kind of issues in performing the following task.

Users can accomplish this task also by using the trial version of this application. In free trial version, the tool will help users in converting 25 OST Files. After having satisfaction user can purchase the licensed keys of the software.