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 Window Updates  

Windows updates and service packs that have been released for your operating system version should be applied. Check for Updates in the Run box and follow the onscreen instructions to install all applicable updates.

  Junk Email Options

While Junk Email Options in Outlook are designed to help you combat spam emails; in some cases, stringent settings can harm the performance of the application. To isolate this cause, change the level of protection in Junk Email Options to Low.

Archive Old Emails

Over  time, your Inbox and folders can end up containing thousands of emails. The regular Archiving of  old emails should occur. This can be done automatically with the AutoArchive feature to ensure Outlook automatically archives old emails after a pre-set period of time.  Or you can archive old emails manually


Disable Hardware Acceleration

The hardware acceleration feature may at times impact the performance of MS Outlook. Try turning off the hardware acceleration feature and check if it helps in improving the performance of the application.

Hardware acceleration refers to the process by which an application will offload certain computing tasks onto specialized hardware components within the system however hardware acceleration doesn’t always work as smoothly as it should.

 Compact  Data File

The Outlook PST Data file needs to be periodically compacted to improve its efficiency. To do so, perform the steps listed below

  • Open the Outlook Application and head to the File tab
  • Under Info, Click on Account Settings and then click on Account Settings
  • Head to the Data Files tab and double click the PST data file and then click on Settings
  • Next click on Compact Now
Compact emails - computer repairs


Disable Antivirus Program Running on Your System

Addons for Outlook form your antivirus program running on your system can conflict  with  Outlook application and slow performance. It’s especially true when you have enabled email scanning by default. T

 Repair  Outlook Application Files

The Outlook application files or related program files of MS Office may develop some errors.  Repairing the installation of Outlook can be beneficial.

Delete  Spam and Deleted  Folders

Over time, you can end up storing many emails in it which you do not need. Likewise your Spam folder may contain many junk emails. These unnecessary emails tend to clog up the memory and can hamper the performance of the Outlook application. So delete all emails present in the Spam and Deleted Items folders.

 Build a New Outlook Profile

Build Outlook Profile - Computer Repairs

Repair the PST Data File using Scanpst

If you receive a messge that the pst file cannot be opened , is corrupt or folders cannot be opened then you need to run the SCANPST.EXE program.

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Depending on your version of Office you can find SCANPST.EXE  in the following locations;

  • Outlook 2019: C:\Program Files (x86)\Microsoft Office\root\Office16

  • Outlook 2016: C:\Program Files (x86)\Microsoft Office\root\Office16
  • Outlook 2013: C:\Program Files (x86)\Microsoft Office\Office15
  • Outlook 2010: C:\Program Files (x86)\Microsoft Office\Office14
  • Outlook 2007: C:\Program Files (x86)\Microsoft Office\Office12
Run scanpst - computer repairs

Launch Outlook in Safe Mode

Add-ins in Outlook can have an  impact on its performance. A specific add-in  may be causing the issue, you need to open Outlook in Safe Mode by holding down the CTRL key and launching the application. If the application works properly in Safe Mode, you need to  disable one specific add-ins one-by-one and then open the Outlook application in normal mode and check its performance.

Start Outlook Safe Mode - Computer Repairs