Fixing Synchronization Errors with the Microsoft Outlook 2000 OST Integrity Check Tool
When using Microsoft Outlook 2000 in conjunction with a Microsoft Exchange Server, the system creates an Offline Folder file (.ost). This file allows you to work with your email, calendar, and contacts even when disconnected from the network.
However, local changes can sometimes fall out of sync with the server database. This mismatch results in frustrating synchronization errors.
To resolve these discrepancies, Microsoft built a dedicated utility directly into the software: the OST Integrity Check Tool (Scanost.exe). Here is how to use it to repair your offline folders. 1. Understand the Symptoms of OST Corruption
You will usually know your file is damaged if you encounter specific warning signs:
Log files: The “Sync Issues” folder contains automated error reports after a manual or scheduled send/receive.
Missing data: Items you sorted or deleted on your local machine still appear in their original state on the Web Access (OWA) portal.
Performance drops: Outlook freezes or hangs specifically when attempting to connect and sync with the Exchange server. 2. Locate the Scanost.exe Utility
The OST Integrity Check Tool does not have a standard desktop shortcut. You must find it manually within your program files. Close Microsoft Outlook 2000 completely. Open your Windows File Explorer.
Navigate to the default installation directory: C:\Program Files\Common Files\System\Mapi\1033</code> (Note: The language folder ID 1033 represents English; this number may vary depending on your localized region). Double-click Scanost.exe to launch the utility. 3. Configure and Run the Repair Process
Once the tool opens, it will guide you through a brief wizard interface to diagnose your file.
Select Profile: A prompt will ask you to choose the Outlook Profile associated with the broken .ost file. Select the correct profile and click OK.
Choose Connection: Select Work Offline or Connect depending on your preference. Working offline is typically faster as it focuses purely on the local structure.
Define Scan Scope: You can choose to scan all folders or select specific folders. For comprehensive troubleshooting, select Scan all folders.
Enable File Repair: Check the box labeled Repair Errors. If you leave this unchecked, the tool will only report errors without fixing them. Begin execution: Click the Begin Scan button. 4. Analyze the Scan Results
The tool will now cross-reference your local folder structures, message IDs, and item counts against the server.
The Process: Scanost.exe will connect to your Exchange mailbox, scan both locations, and look for discrepancies. It will correct mismatched properties and restore missing links.
The Log File: Once finished, a confirmation message will appear. The tool automatically saves a detailed summary text file inside your Outlook Deleted Items folder. You can open this message to see exactly which entries were corrected. 5. Next Steps If Errors Persist
While the OST Integrity Check Tool is highly effective for minor data corruption and synchronization bugs, it cannot fix everything. If you still encounter sync errors after running the tool, your .ost file might be too severely corrupted.
Because the .ost file is simply a local replica of data that still lives securely on the Exchange server, you can safely recreate it. To do this, close Outlook, rename your existing .ost file to .old, and restart Outlook. The program will automatically build a brand-new, error-free local cache from the server data.
If you want to tailor this article for a specific audience or technical environment:
Should I add instructions for newer versions of Outlook (like Scanpst.exe or the modern automated sync sliders)?
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