OST Synchronization Issues in MS Outlook

Do you receive error messages while you synchronize your Outlook with Exchange Server? And do you find some items missing in your mailbox after synchronization? Or do you have any other issue related to OST synchronization? In that case, you need to check whether synchronization is working properly in your Outlook profile.

Check whether Synchronization Works for an Outlook Folder (For Outlook 2003 and 2007)

  1. Right-click the folder and click Properties.
  2. Click the Synchronization tab.

Note: If you do not see a Synchronization tab, it means that your Outlook profile is not set to work in offline mode.


  1.  Under the Statistics for this folder, see the fields: Last Synchronized on, Server folder contains and Offline folder contains.

Note: The Last Synchronized on field shows the date and time of last OST synchronization.

  1. Check whether the number of items in the Server folder contains field and Offline folder contains filed are the same. If they are the same, the synchronization is working correctly. Otherwise, the synchronization is not correct.

If the synchronization is not working properly in your profile, check the profile settings and confirm that the Use Cached Exchange Mode option is selected for your Outlook profile.

Set Your Outlook Profile to ‘Cached Exchange Mode’- For Outlook 2003, 2007 and 2010


Step 1

Go to the Tools menu and click E-mail Accounts.

Go to the Files menu, click Account Settings and select Account Settings.

Step 2

Confirm that the View or change existing e-mail account is selected under the E-mail section of the E-mail Accounts dialogue box; click Next.

Click the Data Files tab and confirm that Mailbox – <account name> is set as the default.

Step 3

Confirm that Mailbox – <account name> is selected in the list Deliver new mail to the following location.

Click the E-mail tab.

Step 4

Click the object Microsoft Exchange Server; click Change.

Click Mailbox – <account name> and select Settings.

Step 5

Make sure that Use Cached Exchange Mode is selected; click Next.

Click the Advanced tab and make sure that Use Cached Exchange Mode is selected; click OK.

Make sure that Use Cached Exchange Mode is selected; click OK.

Step 6

Click Finish; click OK.

Click Close in the Account Settings dialogue box.

Step 7

Exit Outlook; re-open Outlook.

If the OST synchronization issue persists, you need to use the OST Integrity Check tool or a third party tool to fix the synchronization issue.

Scanost.exe (OST Integrity Check Tool) – A Microsoft Utility to Deal with OST Synchronization Issues

Scanost.exe (OST Integrity Check Tool) is an inbuilt Microsoft tool that is available with Microsoft Outlook 2003 and 2007. It helps you deal with the OST synchronization issues in those versions. But this tool is not available from Outlook 2010 onwards. However, Microsoft is offering some other methods to deal with OST Synchronization issues in Outlook 2010.


Kernel for OST to PST

Kernel for OST to PST is an OST to PST conversion tool that works with almost every version of MS Exchange Server, MS Outlook and Outlook Express. It helps you access inaccessible OST files by convert OST to PST. It is an excellent solution when your OST files become inaccessible due to OST synchronization issues. This tool is very popular because of its simple user interface and the availability of free trial version.

For more details go with this link:- http://www.convertosttopst.org/

Leave a comment


  1. Adam smith

     /  February 21, 2014

    If OST file goes in unusable and unworkable mode and scanost.exe outlook utility fails to recover the corrupt inaccessible ost file. You can use the kernel for OST to PST conversion tool that efficiently converts the .ost files into .pst files. It’s excellent solution for inaccessible OST files due to OST synchronization issues.

  2. Adam

     /  April 24, 2014

    OST to PST conversion tool is very quick and easy solution for access inaccessible OST files, it’s recover inaccessible OST files from offline exchange mailbox and convert into Ms Outlook PST files format Easily.


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