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Fix Outlook Performance Issues Related Large PST Sizes

Updated On - October 7, 2022 by Nasir Khan |

Reading Time: 6 minutes

Today in this blog, we learn about the Outlook performance issue with large Outlook PST file size. How to fix this error in an efficient manner. Go ahead.

The moment your Outlook PST file size increases, the Outlook starts lagging, starts causing abruption or pause while sending, receiving, or deleting emails. In such a behavior, you must try to reduce the Outlook PST file size.

Outlook users may encounter message as:

your mailbox has reached its maximum size limit

Outlook performance Issues caused by Large sized PST Files

Large-sized PST file can cause several issues such as:

  • PST file corruption due to data integrity
  • Outlook performance issues
  • Outlook errors such as Not Responding, Outlook crash, etc.

6 Tips to Reduce Large Size PST files to improve Outlook performance

1. Configure Outlook PST file size limit

Microsoft Outlook users can set the PST file size limit by registry modification. Outlook user can configure PST file size limit by modifying the registry entry size value.

2. Remove duplicate emails from Outlook PST file

Duplicate emails also result in oversized PST file. Removing duplicate emails can help resolve the Outlook performance issue. Reasons that may lead to duplication of emails include –

  • Incorrectly configured Rules
  • Short Send/Receive intervals
  • Improper Mailbox settings
  • Incorrect Account setup
  • Third-party anti-virus scanner

3. Manual Steps to reduce the large size of PST files

To improve the performance of MS Outlook, you must reduce the Outlook mailbox size firstly by deleting unwanted email items and then compacting the Outlook PST files. To achieve this, perform the steps as discussed below:

  • Launch Microsoft Outlook application.
  • Right-click on the Deleted Items folder and then click Empty Folder. 2
  • Or select the folder that is no longer needed, in the Home menu, click the Cleanup In the drop-down menu select any of the three options (Clean Up Conversation, Clean Up Folder, and Clean Up Folder & Subfolders) to delete unwanted files and duplicate data from the folder. 3

1.Clean Up Conversation: This option deletes duplicate or unimportant email messages from the selected folder.

2. Clean Up Folder: This option deletes the message(s) from a certain folder.

3. Clean Up Folder & Subfolders: This option deletes the folder that is not required.

  • Click File > Account Settings > Account Settings. 4
  • Under the Data Files tab, choose your Outlook data file and click Settings. 5
  • In the Outlook Data File dialog box, click Compact Now > click OK. 6

On following the above steps, your Outlook PST file will be compacted.

7

4. Archive your Outlook Data

Archive old Outlook mailbox data to keep your mailbox from filling up and reaching its maximum size. Move the old items you want to keep to an archive i.e., a separate Outlook Data File (.pst). The archive can be accessed whenever needed.

Note: The Archive and AutoArchive options might not be available in your Outlook mail if your profile connects to an Exchange Server.

Archiving Data in Outlook 2013 / 2016 / 2019

  1. Launch MS Outlook application.
  2. Click File > Info.
  3. In Outlook 2013, click Cleanup Tools > select Archive.
  4. In Outlook 2016, click File > Info > Tools > Clean up old items. 8
  5. Select Archive this folder
  6. Under Archive items older than, select a date.
  7. Click Browse to select the folders you need to archive.
  8. Select the checkbox Include items with “Do not AutoArchive” checked to archive individual items that are excluded from automatic archiving.
  9. Click OK. 9

#Archiving Data in Outlook 2010

  1. Launch MS Outlook application.
  2. Click File > Cleanup Tools > Archive.
  3. Select Archive this folder and all subfolders and then select the folder that you want to archive.
  4. For Archive items older than specify a date.
  5. Click Browse to specify a location for the archived file.
  6. Select the checkbox Include items with “Do not AutoArchive” checked to include all items that might be individually marked to be excluded from automatic archiving
  7. Click OK.

Archiving Data in Outlook 2007

  1. Launch MS Outlook application.
  2. Click File > Archive.
  3. Select Archive this folder and all subfolders
  4. Specify a date for Archive items older than.
  5. Click Browse to specify the location for saving the archived file under Archive file.
  6. Select the checkbox Include items with “Do not AutoArchive” checked if you want to override a previous setting to not automatically archive specific items.

5. Import/Export Process

Import/Export Wizard allows reducing Outlook PST file size. This method does not split the PST file but takes a backup of the old data and transfers them into a new PST file. Using this method, you can manually create smaller PST files segregating the old and new data or move mailbox data from one PST file to the other.

  1. Launch MS Outlook application.
  2. Click File > Account Settings > Account Settings. 10
  3. Click Data Files > Add. 11
  4. Enter a name for the PST file. Type the Outlook data file as “.pst” > click OK to create a new PST.

The new PST file will be visible under Data Files.

  1. Click File > Open & Export > Import/Export. 12
  2. In Import and Export wizard, select Export to a File > click Next. 13
  3. In Export Outlook Data File wizard, select Outlook Data File (.pst) > click Next. 14
  4. In Export Outlook Data File wizard, choose the required folder to export and select option Include subfolders. 15
  5. Click Browse to specify a location to save the exported file.
  6. Select Do not export duplicates items
  7. Click Finish. 16

Limitations with Manual Steps

  • A time-consuming process.
  • Chances of data loss.
  • Manual method doesn’t work if PST file is corrupted due to oversize.
  • Not applicable for very large PST files.

6. Professional PST Splitter Tool

Use professional third-party Regain PST Splitter to split large or oversized Outlook PST file into smaller PST files. The tool maintains the email properties and folder hierarchy while performing the PST split process. The utility even supports splitting password-protected Outlook PST files. The tool supports both Outlook ANSI and Unicode formats for splitting PST files.

The tool offers three different splitting options –

  • Split by Size
  • Split by Date
  • Split by contain words – To, From, CC, BCC, and Subject

Fully compatible with all versions of MS Outlook and Windows operating systems, the PST Splitter tool offers self-descriptive graphical user interface that makes PST file splitting process an easier process for non-technical users. The available free demo version allows users to check its capabilities before purchase.

Just 5 steps and you are done with PST Split

  1. Launch PST Splitter software.
  2. Select the PST file that you want to split in smaller PST files.
  3. Split among the available options to split Outlook PST file.
  4. Select destination path to save split PST file.
  5. Click Next to complete the split process.

Conclusion

Large-sized Outlook PST files results in low performance of the Outlook application. Thus, it becomes the need of the hour to manage the large-sized PST files, either split them in small PST files or reduce the size of PST files by compacting them. This article discusses manual steps for splitting Outlook PST files. Since manual steps has some limitations, we highly recommend using a professional PST Splitter tool to split large-sized PST files. The free demo version is available to let users check the capability of the software before purchasing the licensed version.

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Author: Nasir Khan

I am Nasir Khan from India, working as a Content Developer in Regain Software. Here I am writing about our products and their updates. And writing some free solutions from converting emails or Cloud Migration process. We have tools like Email Converter, Emails backup and Cloud migration.

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