Troubleshoot Microsoft Outlook Running Slow or Locking Up

Affected Products:

• Microsoft Outlook
• Microsoft Outlook 365

When the Outlook program suffers from performance issues, there are several issues that may be the cause.

• A corrupt or damaged PST File
• An Outlook Add In, not functioning
• A Corrupted Outlook profile
• A Problem with the Outlook application

• For general performance troubleshooting for Microsoft Outlook, reference the Microsoft article, How to troubleshoot performance issues in Outlook .
• To browse specific Microsoft fixes for recent Outlook issues, reference Microsoft article, Fixes or workarounds for recent issues in Outlook for PC .
• For Microsoft 365, reference Outlook performance is slow in the Microsoft 365 environment .
• For Office service availability, check the status at Office Service Status