Outlook Not Opening / Crashing: 7 Fixes Including PST Repair (Jun 2026 Update)

Outlook failures are business-stopping events. Your email, calendar, contacts, and task list are all locked inside a frozen application. Here are the seven most effective fixes, ordered from simplest to most advanced.

Fix 1: Disable Add-ins (Fixes ~40% of Crashes)

Third-party Outlook add-ins (Adobe Acrobat, Zoom, Teams plugin, Grammarly) are the #1 cause of Outlook crashes. Start Outlook in safe mode to confirm: outlook.exe /safe. If it opens, an add-in is the culprit. Disable them via File → Options → Add-ins → Manage COM Add-ins.

Fix 2: Repair Your Outlook Profile

Control Panel → Mail → Show Profiles → Add a new profile. Sometimes a corrupted profile is the only issue, and creating a new one with the same email account resolves everything in 3 minutes.

Fix 3: Run ScanPST.exe (Inbox Repair Tool)

For Outlook.pst corruption — which causes crashes when loading the mailbox. Locate ScanPST.exe (typically in C:\Program Files\Microsoft Office\root\Office16\), browse to your PST file, and run the scan. Always back up the PST before running this tool.

Fixes 4–7 Summary

• Fix 4: Update/repair Office via Control Panel → Programs → Microsoft 365 → Repair (Online Repair)
• Fix 5: Clear the Outlook AppData cache: %localappdata%\Microsoft\Outlook — delete .xml and .tmp files
• Fix 6: Recreate the Navigation Pane configuration by running outlook.exe /resetnavpane
• Fix 7: Full uninstall/reinstall of Microsoft 365 using the Microsoft Support and Recovery Assistant (SARA) tool — only as a last resort