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Outlook .ost Cannot be Opened- Resolve the Error with Ease

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Hunting a strategy to resolve “Outlook .ost can’t be opened” error in Microsoft Outlook? Never be panic. In the following paragraphs, we’ll attempt to provide a perfect and authentic means to fix you using that they can certainly get back their OST fill data in Outlook.

Microsoft Outlook is really a prominent email application that gives various facilities to users. In Outlook, an OST file is required to do the daily task. Unlike PST files, one do not need to local machine always connecting to Server because it enables to operate offline and sync with Microsoft Exchange Server to update the alterations. The default location from the OST file is:

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The Outlook .ost computer file too will get corrupted as with every other file. It faces OST corruption because of various infections, adware and spyware, along with other issues. Because of the corruption, OST file mailbox data products including emails, contacts, calendars, occasions, journals, etc. become inaccessible towards the users.

Such scenarios, multiple errors appear like ‘Default Outlook .ost can’t be opened’. One method to save emails and also to prevent such action would be to backup emails in a regular interval, Archive Outlook .ost file to see e-mail in situation of server maintenance or downtime.

Some common OST file errors in MS Outlook

Outlook users must know about the OST file. So, you will find chances they might encounter the issue Outlook OST can’t be opened up. Another OST file errors that are very frequent and therefore are faced by Outlook users are:

  • OST file is being used by another application
  • Microsoft Outlook not responding
  • Default Outlook .ost is being used and can’t be utilized
  • Cannot open Outlook window
  • OST file can’t be opened up
  • The group of folders can’t be displayed
  • Cannot open particular Outlook products when offline
  • Summary of Outlook .ost can’t be opened up error

If the error message mentioning Outlook OST file can’t be opened up is displayed while opening Outlook OST file, you can test to spread out the OST file by utilizing certain methods for example – beginning Outlook OST file in Safe Mode, switching off Compatibility Mode, and so forth.

If nothing calculates and also the OST file still will not open, this doesn’t imply that you cannot connect to the OST file again. There might be various reasons for OST file corruption that have been described below.

So why do we obtain the “Outlook .ost can’t be opened” Error?

There are several probable reasons which might make the above-pointed out error:

Abrupt termination of Outlook when OST file is being used.

Improper installing of Outlook.

Importing OST files within an improper way.

Interruption while discussing OST files over the network.

Synchronization error between OST file and Exchange Server mailbox products.

Exiting a broadcast group or organization.

Techniques to fix Default Outlook .ost can’t be opened up error

Users can trobleshoot and fix this OST file issue using manual approaches. With this, first, have a backup of .ost file. When the issue continues, you can test to restart the machine. Here, the manual solutions for fixing Outlook .ost can’t be utilized errors are discussed.

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Method 1: Finish entire Outlook related processes

Close MS Outlook program.

Right-click the Taskbar menu after which click Task Manager.

Visit the Processes tab.

Now, within the Processes tab, search for the processes Communicator, Lync, Outlook or Ucmapi. If these processes found, select and then click Finish Process button.

Method 2: Disable Outlook Cached Exchange Mode

Close MS Outlook and visit the User Interface.

In to the User Interface, click the Mail option after which select Email Options.

Underneath the Email Options, hit a click the Email tab.

Now click Exchange account after which on Change.

Uncheck the utilization Cached Exchange Mode option under offline settings striking Alongside finish the procedure.

Method 3: Disable the Outlook Add-ins

Although Outlook Add-ins use to boost the functionality of Outlook, faulty add-ins may sometimes create more trouble. Thus, disable the add-ins by launching Outlook in safe mode just by typing outlook /safe within the Run dialog box.

Try “Save and Send” and when it really works, a faulty add-was the primary cause of the mistake. You may also start Outlook in safe mode by using the below-pointed out steps:

Visit the shortcut icon for Outlook.

Now, press and contain the CTRL key and double-click on the application shortcut.

Click ‘Yes’ whenever a window prompt seems asking if you wish to start the applying in Safe Mode

Method 4: Repair OST file with ScanOST.exe

Microsoft facilitates you by having an inbuilt ‘OST Integrity Checker’ tool i.e. known as ScanOST.exe which will help to rectify minor corruptions in OST files and resolves Outlook OST file errors.

Repairing Outlook OST file with ScanOST.exe is a great method to fix the “Outlook .ost can’t be opened” error. However, this Outlook inbuilt utility can be obtained with Outlook 2007 minimizing versions only.

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Exit the Outlook and visit the directory in your system where Outlook continues to be installed. Now, visit the ScanOST.exe striking a dual-click to produce it

The applying will prompt you to decide the OST apply for repair. Browse to decide on the OST file. Should you not know its exact place, you’ll find it by typing the next within the Run dialog:“%LOCALAPPDATA%MicrosoftOutlook”

Now, choose the appropriate mailbox along with other options accordingly

Finally, select “Repair Errors” and then click the “Begin Scan” choice to instantly check and take away the discrepancies within the OST file

Limitations of manual methods

The manual methods are extremely lengthy, tiresome, and time-consuming.

It’s a cumbersome job for non-technical users because it requires some technical understanding.

It doesn’t ensure data integrity and security.

Automated Approach to Fix Outlook ost can’t be opened up Error

If both above methods do not work to solve the “Default Outlook .ost can’t be opened” error, you are able to go for ScanPST.exe utility to repair this error. Although, ScanPST.exe works only in situation of minor OST file corruption. Hence, Experts advise utilization of another-party OST to PST Ripper tools software to recuperate and convert seriously corrupted OST file and also the data connected by using it to PST.


Though, while using above manual methods, it’s possible to easily resolve the “Outlook .ost can’t be opened” error. But, if your problem still occurs, you are able to surely choose a fast and better solution, you may choose to utilize a professional OST to PST ripper tools. Hope the content helps.

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