Fix Oversized OST file issue in Outlook using Manual Method

OST to PST Converter /March 26, 2025

OST file store Important information But excessive data storage make it oversized and effect Outlook performance and generate multiple issue
In this article we provide you fix oversized OST file issue in Outlook with easy tricks.However if user OST file many time corrupted due to oversize ,user use Goldytools OST to PST Converter and split into multiple files..
Both and PST files store User important data ,Its contain user data including email ,calendar ,task ,calendars etc.

Difference between OST and PST files is that PST files works on Online mode and OST file work in Offline mode. Some time OST file size cross size limit then Corrupted OST file and impact Outlook performance

Mange OST file size should a top priority .Reduce OST file size it solved OST corruption issue.OSt file storage capacity depend Outlook version.

Outlook version

How do OST files exceed oversized limit?

OST file stores all data user generated or received since user account activatedIt include email emails , attachments calendar ,contacts , tasks , notes, Public folder ,etc.When user not delete unnecessary data ,it get collect ,exceed the file storage limit then OST file corrupted and Outlook face performance issue.
Oversized OST file increase by Large attachment file . If user not managed OST file size limit then user face Outlook performance issue .Hence it necessary to reduce Outlook OST file size ant maintain It Performance

Common issue due to oversize OST file

When User OST file become oversized then user face common problem,inluding

  1. OST file can not be open or load
  2. Unable to add data to OST file.
  3. Error message genrate during Synchronization
  4. common issue synchronization between OST file and MS Exchange Server.

Manual method to Fix common issue to Oversized OST file

there are many effective method to resolve to oversized OST file issue by using these method user save OST file for corruption and accessing their data any time.user follow basic step before applying manual method to shrink OST file to remove unsed and unwanted data from OST file.

  1. Permanently delete unwanted data from OST File .
  2. Save large OST File attachment on Local system for better performance
  3. Regularly Clear Deleted items folder in OST Mailbox
  4. Move and Change the name of OST file form it default location and generate it again

Now we explore the manual method to resolve oversized OST issue and improve Outlook performance

Method 1: Disable unwanted add-ins from Outlook to improve Outlook performance

Many add-ins in Outlook consume extra data from OST file and affect its performance .If user want to improve Outlook performance ,Disable add-ins to reduced OST file size.Follow these step

  1. Click on File in Outlook then Select Options

    2. Select Options

  2. In Outlook Option choose Add-ins and go to Manage .Choose COM Add-Ins and Click Go

    3. Add-Ins

  3. Uncheck any unnecessary add-ins that not in use and click OK

    4. add-ins

    Method 2. Archiving OST file data

    Archiving OST file data help reduce OST file Size and remove some space on server . user change location archive OST file location in Local system .Archiving prevents the OST file from excess it predefined size limit . Follow steps below

    1. Click on the File tab>click Tools>select Mailbox Cleanup.

      2. Mailbox Cleanup

    2. Next, two available options.

      3. –.user can move older mailbox data to archive folder by choose The AutoArchive option–
      —Click Empty and delete data from Deleted folder.

      mailbox

    Method 3. Using clean-up option

    User can deleted unnecessary data and other data. Outlook provide a Cleaning Clean Up Option to remove unwanted email from Deleted items folder Follow these step-

    1. Open Outlook then click navigate tab.
    2. navigate tools and Click on Mailbox Cleanup
    3. Select Empty under “Emptying the deleted items folder, permanently delete those items.”

    Method 4.

    Goldytools OST to PST Converter is powerful tool which repair corrupted filed and Save it into PST file format without any data loss
    You can download “Trial Version” for free and retrieve your lost or inaccessible data in different formats as required. Features like an In-built search option, smart filters, splitting OST files, a complete preview of files,
    Split PST feature in Goldytools OST to PST converter tool then resolve issue relative OST file Oversize.

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