TL;DR:
⚡ Quick Fix: Fix Outlook Crashing When Opening
● Start Outlook in Safe Mode: Run outlook.exe /safe to bypass add-ins, then disable COM Add-ins and re-enable them one by one to find the faulty extension.
● Repair Outlook Data Files: If Outlook crashes because of corrupted PST or OST files, scan and repair the email data file, then preview and export restored emails safely.
● Rebuild the OST Cache: For Exchange or IMAP accounts, rename the damaged .ost file to .old and restart Outlook so it can create a clean offline data file.
● Repair and Update Office: Run Quick Repair or Online Repair for Microsoft Office, then install the latest Outlook updates to fix startup bugs and compatibility issues.
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Is your Outlook crashing when opening or freezing continuously on startup? While Microsoft Outlook remains an industry-standard email client, issues like faulty COM add-ins, corrupted OST/PST data files, or broken Office installation files can prevent it from launching properly.
Part 1: Why Outlook Keeps Crashing When Opening?
Identifying the root cause helps you choose the right fix quickly. Common triggers for startup crashes include:
- Incompatible COM Add-ins: Third-party plugins or outdated extensions often interfere with Outlook's boot process.
- Corrupted Data Files (.PST / .OST): Sudden power outages, storage sector failure, or unexpected shutdowns can break file structures.
- Damaged Outlook Profile: Account configuration errors force the application to terminate immediately upon launch.
- Outdated MS Office Installation: Missing recent patches or bug fixes released by Microsoft.
Part 2: How to Fix Outlook Crashing on Startup?
Work through these step-by-step solutions to restore your Outlook application to normal operation.
1 Repair Corrupted Email Files with Repairit for Email
If Outlook crashes due to damaged OST or PST files, built-in tools may fail to process severe corruption. Using a specialized solution like Wondershare Repairit for Email allows you to restore severely damaged email databases seamlessly on both Windows and Mac.
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It repairs damaged or corrupted OST/PST files in Outlook in different scenarios, such as virus attacks & trojan horses, hard disk crashes, and improper shutdown procedures, and more.
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It recovers Outlook emails that have been deleted for an extended period of time and extracts Email messages, folders, and calendars in seconds.
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It restores deleted emails and repairs corrupted emails with a 100 percent success rate.
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It repairs Emails in batches without size restrictions and previews them all prior to saving.
Step 1: Launch Repairit and Select Files
Open Wondershare Repairit for Email. Click Select File to search for corrupted PST or OST files manually, or click Find to auto-detect data locations.
Step 2: Start Data Repair Process
Click the Repair button. The algorithm will scan, extract, and rebuild your email components.
Step 3: Preview and Export Restored Emails
Preview your recovered emails, attachments, and folders in the left panel. Choose a destination folder and click Save to export your healthy data file.
2 Start Outlook in Safe Mode & Disable Faulty Add-ins
Launching Outlook in Safe Mode bypasses all installed extensions, allowing you to identify if a faulty plugin is triggering crashes.
Step 1: Press Windows + R, type outlook.exe /safe in the Run dialog, and press Enter.
Step 2: If Outlook opens without crashing, go to File > Options > Add-ins.
Step 3: Under Manage at the bottom, select COM Add-ins and click Go.
Step 4: Uncheck all add-ins, click OK, and restart Outlook normally. Re-enable add-ins one by one to locate the offender.
3 Rebuild Outlook OST Data File
If you use Exchange or IMAP accounts, renaming your cached local file forces Outlook to generate a fresh, uncorrupted OST file upon restart:
1. Open Outlook and navigate to File > Account Settings > Account Settings.
2. Switch to the Data Files tab, select your primary account, and click Open File Location.
3. Close Outlook completely. Locate your .ost file, right-click, select Rename, and change its extension from .ost to .old.
4. Relaunch Outlook to automatically build a clean offline data cache.
4 Run MS Office Online/Quick Repair
If critical Microsoft Office installation binaries are broken, Windows can automatically repair the suite:
1. Press Windows + R, type appwiz.cpl, and press Enter to open Programs and Features.
2. Locate Microsoft 365 (or Microsoft Office) in the list, right-click, and choose Change.
3. Select Quick Repair first. If startup crashes persist, run Online Repair for a comprehensive fix.
5 Update Microsoft Outlook to the Latest Version
Outdated Office builds may contain unresolved memory leaks or compatibility bugs with modern Windows updates:
1. Open Outlook (or any Office app like Word), click File, and select Office Account.
2. Click Update Options next to Office Updates.
3. Click Update Now to check for and install pending patches.
Part 3: Frequently Asked Questions (FAQs)
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Q1. What Causes Email Crashes?
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A1: Several factors can cause email crashes, but the main one is a server problem. Your emails won't be sent or received due to server malfunction.
IMAP accounts use the OST file format, whereas POP accounts use PST files. The POP and IMAP email protocols are so widely used by email providers. -
Q2. What exactly is Microsoft Outlook's safe mode?
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A2: Safe mode in Microsoft Outlook is a feature that allows the email program to launch with a limited set of features. If your Outlook frequently crashes, try starting it in safe mode.
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Q3. How to check for errors in Outlook?
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A3: You can diagnose and repair Outlook data file errors using the inbox repair tool SCANPST.EXE to check for outlook errors. It determines whether the data files are in proper condition.
Related Readings:
1. Fix Outlook Not Updating Automatically
2. Fix Outlook Keeps Crashing on Windows in 3 Minutes
Conclusion
The 'Outlook keeps crashing when opening' problem is common, as many users have reported. This crash issue can occur if you use faulty add-ons or compromise your account settings. Occasionally, data file corruption contributed to this issue.
After reading this article to its conclusion, we hope you have resolved your issue. If you still have any queries or doubts, you can send us a message right away.
