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Fixed Oversized OST File issues in Outlook using Manual Tricks

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[Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

[Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

Microsoft Outlook stores the data in two types of files – PST and OST. OST stands for Offline Storage Folder and PST for Personal Storage Folder. OST file allows the users to compose, read, and see the mails offline. It serves as the replica of mailbox data on the Microsoft Exchange server. It stores all the mailbox data, including emails, notes, attachments, calendar schedules, public folders, and so on.

OST file has a predefined data size limit, based on the Outlook versions. Outlook 2002 has a limit of 2 GB for Outlook data file, Outlook 2007 has a 20 GB limit, and Outlook 2010, 2013, 2016, 2019, and Office 365 have 50 GB limit. At times, when the OST file becomes oversized, you may face technical issues with Outlook.

What Issues you may face due to Oversized OST File?

  • Microsoft Outlook crashes when opening

  • Error messages displayed during the synchronization

  • Cannot add new data to the OST file

  • Synchronization may fail between MS Exchange Server and OST

Methods to Fix Oversized OST File Manually

You can easily fix the oversized OST files issue by following any of the given methods discussed in this section.

  1. Use Clean-up Option to Reduce the Size of OST File

You can delete unnecessary emails and other items to reduce OST file size. Outlook offers an option that allows you to delete emails from the Deleted Items folder. Here are the steps to use the clean-up option.

    1. In Outlook, click on the File Tab.

    2. Choose the Tools >> Mailbox Cleanup.

    3. Choose the Empty Deleted Folder Items to delete all files in a single click.

  1. Disable the Add-Ins

Sometimes, add-ins in the Outlook that may affect the normal functioning of Outlook. In such a case, you can disable them to resolve the issue. Follow the below-given steps.

    1. In Outlook, click on the File Tab.

    2. Choose Add-ins from the Outlook options.

OST File issues in Outlook using Manual Tricks

    1. Choose COM Add-Ins and press Go from the Manage Option of Add-in.

OST File issues in Outlook using Manual Tricks

    1. Unselect all those Add-ins that are not currently being used and click on OK.

[Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

  1. Archive the Outlook Data

Archive the OST file data to create a backup, which helps reduce the OST file size. You can store this archived data at a different location on the system. Here are the steps:

    1. In Outlook, click on the File Tab.

    2. Click on Cleanup Tools >> Archive.

[Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

    1. Click on the AutoArchive option to archive the files.

    2. If you’re using Outlook 2019 or 2016, go to Files >> Info >> Tools >> Clean Up Old Items.

OST File issues in Outlook using Manual Tricks

  1. Compact the Outlook Data File

You can use Outlook’s built-in Compact Now feature to reduce the OST file size. Follow the below steps:

    1. Delete all the data that is not required.

    2. Review the folder list, choose Deleted Items, and click on Empty Folder.

    3. Then, click on the File tab and choose Account Settings.

    4. In the Data Files tab, choose the data to be compressed or compacted and click on Settings.

OST File issues in Outlook using Manual Tricks

    1. In the dialog box that opens, click on the Advanced Tab and click on Outlook Data File Settings.

      [Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

    1. Open Outlook Data File Settings dialog box and click on Compact Now.

  1. Increase the OST File Size Limit in the UNICODE Registry

You can increase the OST file size by following these steps:

    1. Click on the Start button.

    2. In the Run Window, type Regedit.

    3. Find the Registry Keys:


Outlook 2010: HKEY_CURRENT_USER\Software\Policies\Microsoft\Policies\14.0\Outlook\PST

Outlook 2013: HKEY_CURRENT_USER\Software\Policies\Microsoft\Policies\15.0\Outlook\PST

Outlook 2007: HKEY_CURRENT_USER\Software\Policies\Microsoft\Policies\12.0\Outlook\PST

    1. Next, find MaxLargeFileSize by right-clicking on the Registry. Click on Modify and enter the MB values in the Value Box.

    2. Next, right-click on WarnLargeFileSize -> Modify -> enter the MB values in the Value Box.

All the above-mentioned methods will help you reduce the OST file size and minimize instances of corruption. However, if the OST file gets corrupted or becomes inaccessible, you can use a third-party OST to PST converter software to recover data from such files.

How to Use OST to PST Converter Software?

There are many software available that you can use to convert inaccessible OST files to Outlook PST files. Stellar Converter for OST, Remo Outlook OST to PST Converter, Shoviv OST Recovery, and Softaken OST to PST Converter are a few popular ones in this category. Among these, Stellar Converter for OST comes with advanced conversion features. This software converts all your mailbox components, including attachments, emails, calendars, and contacts. This software can easily convert large OST files. It can export OST fil data directly to Office 365 and live Exchange Server. There is a free version of the software that you can download on your system to evaluate its functionality.

Conclusion

You may face several issues with your Microsoft Outlook due to oversized OST files. This post offers DIY solutions to resolve the issue. In case the OST file becomes inaccessible, you can use an OST to PST converter software to recover the OST file data and save it in PST file. [Fixed] ‘Oversized’ OST File issues in Outlook using Manual Tricks

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