From time to time, you may get error messages when synchronizing your Offline Folder file (.ost) in Microsoft Office Outlook with your mailbox on a server running Exchange. You may also notice that some items are missing from your .ost file or from your mailbox after you synchronize your .ost file and your mailbox. When this occurs, you should use the OST Integrity Check tool (Scanost.exe) to check your .ost file.
The OST Integrity Check tool runs only on .ost files and can be used to diagnose and repair synchronization issues. The tool scans both your .ost file and your mailbox on the server running Exchange, compares the items and folders in each, and attempts to reconcile synchronization differences between them. The OST Integrity Check tool does not change your mailbox on the server running Exchange. The tool records any differences in a scan log so that you can see the discrepancies that it found and resolved. The scan log also identifies any situations that the tool could not correct which you will need to fix manually. The scan log can be found in your Deleted Items folder.
To use the OST Integrity Check tool, you must connect to your Exchange account so that the tool can scan your mailbox folders and items. If you previously set up Outlook to start offline automatically, the OST Integrity Check tool will not be able to access your mailbox on the server running Exchange. Therefore, before you run the tool, you need to change your Outlook startup settings temporarily.
If you have problems opening your .ost file, you can use the Inbox Repair tool (Scanpst.exe) to diagnose and repair errors in your .ost file. The Inbox Repair tool (Scanpst.exe) can be used on your .ost file as well as Personal Folders file (.pst). The tool scans the .ost or .pst file, and makes sure that the file structure is intact. It does not interact with your Inbox on the server running Exchange server in any way.
The OST Integrity Check tool (Scanost.exe) is installed when you install Outlook. It is located at:
drive:\Program Files\Microsoft Office\OFFICE12.
REPAIR ERRORS BY USING SCANOST.EXE
Exit Outlook if it is running.
Double-click Scanost.exe, located at drive:\Program Files\Microsoft Office\OFFICE12.
If you have set up Outlook to prompt for a profile, the tool will also prompt you for one. In the Profile Name list, click the profile that contains the .ost file that you want to check.
If you are prompted to Connect or Work Offline, click Connect.
Select the options that you want.
To have the tool automatically resolve discrepancies that it finds during the scan, select the Repair Errors check box. If this check box is cleared, the tool will log the problems but not make the necessary corrections.
Click Begin Scan.
NOTE To view the scan log, start Outlook, and then open the Deleted Items folder. The tool does not scan the Deleted Items folder. Any problems will be noted in a message with the Subject "OST Integrity Check."
http://office.microsoft.com/en-us/outlook-help/scan-and-repair-corrupted-outlook-data-files-HA010075831.aspx
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