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Fix Office Crashes and Missing PST Files After an Update
Question details
The user is experiencing Office application crashes, continuous license prompts, and missing PST files and contacts after an update.
- Product
- Microsoft Office / Outlook
- Device & OS
- not provided
- Scenario
- Attempting to access backed-up emails via a PST file and import a CSV address book after updating Microsoft Office.
- Observed behavior
- Office applications crash or repeatedly ask for authentication. PST files and contacts are inaccessible because the New Outlook does not support importing them, and the classic application appears to have been removed.
Before proceeding with any registry edits or reinstallations, ensure you have safely backed up your existing PST and CSV files to an external drive or separate folder, and verify your Microsoft account subscription status online.
Revert to Classic Outlook to Restore PST File Access
The New Outlook lacks full support for PST files and local CSV imports. Switching back to Classic Outlook is the most effective way to regain access to your backed-up emails and contacts.
Microsoft's New Outlook is built on web-based technologies and currently lacks several features found in the legacy desktop client, including robust support for local PST data files.
If the Classic Outlook application was removed during an update, you might need to launch it from the system executable or reinstall the desktop suite.
Open the New Outlook application. Look for the 'New Outlook' toggle in the top-right corner of the window and switch it to the 'Off' position. The application will close and attempt to launch Classic Outlook.
If toggling does not work, open the Windows Start menu, type 'Outlook.exe', and select the legacy Outlook application. If it is missing, you will need to proceed to the solution for reinstalling Office.
In Classic Outlook, go to File > Open & Export > Import/Export. Choose 'Import from another program or file' to bring in your CSV address book, or choose 'Open Outlook Data File' to mount your backed-up PST file.
Clear Office Authentication Cache and Registry Keys
If Office continues to crash or repeatedly prompts for a license, clearing the IdentityCache and OneAuth folders can resolve deep-rooted authentication conflicts.
Repair or Reinstall Office with an Offline Installer
If the classic application was completely deleted or the software remains unstable, a fresh installation using the offline installer ensures all components are restored correctly.
Switch to WPS Office for a Stable, Crash-Free Experience
Tired of dealing with frequent Microsoft Office crashes, complex registry fixes, and licensing issues? WPS Office offers a free, lightweight, and highly stable alternative for all your document, spreadsheet, and presentation needs.
- 1. Download the Installer: Visit the official WPS website and download the free WPS Office installer.
- 2. Install the Software: Run the lightweight installer and complete the setup in just a few clicks.
- 3. Open Your Documents: Launch WPS Office to instantly open, edit, and save your existing Microsoft Office files without any compatibility issues.
Frequently Asked Questions
Why can't I import PST files into the New Outlook?
The New Outlook for Windows is built primarily on web technologies designed for cloud synchronization and currently does not fully support mounting or importing local PST data files. You must revert to Classic Outlook to access these files.
Where are my Outlook PST files normally stored on my computer?
By default, Classic Outlook stores PST files in your Documents folder under 'Outlook Files', or occasionally in a hidden local AppData directory depending on how your Windows user profile and email account were initially configured.
How do I fix repeated Microsoft Office license prompts?
Repeated license prompts are usually caused by stale or corrupted authentication tokens. Clearing the 'OneAuth' and 'IdentityCache' folders located in your local AppData directory generally resolves this persistent problem.
Will I lose my emails if I uninstall and reinstall Office?
No, your emails, contacts, and calendar data are either safely stored on your email provider's server or locally within your PST/OST files. Uninstalling the Office software does not delete these local data files.
