Resolve “Why I Cannot Access My OST File” Issue

Aldrich Calvin | Last Modified: July 28th, 2020 | Outlook

Summary: Sometimes Outlook users have raised a question Why I cannot access my OST file. So in this problem tackling blog we are going to provide you the reasons and best possible solutions to access and recover your crucial mailbox data.

While opening an Outlook OST data file, a large number of users may have seen that an error spring up ‘Can’t open your default email folders. The file xyz.ost isn’t an offline folder file’ and you are unable to access the OST file. Actually, there are loads of errors where you can’t get to the data items of the OST file.

In addition, there are a lot of reasons because of which you can’t get to the OST file in MS Outlook. Sometimes it happens as a result of System Crash, or because of Corruption in Offline Storage Table File. Whatever the explanation be, there’s consistently a solution for any issue. Thus, we should outline what to do to make the OST file working once again.

Please Help! I am using Outlook application for email communication. Currently I am not able to access OST mail box data items. Can anyone tell the possible reasons why I cannot access my OST file items . Also provide me the relevant solution to access OST file data items. Thanks!

Instant Solution: The user can Take the help of SysTools OST Conversion Tool to access and export crucial OST file mailbox items. This application is compatible with Outlook 2019 and below version. The user can download the software from here.

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Reason Behind Inaccessibility of OST File

Clients will most likely be unable to get to OST file because of a few reasons, for example,

  • Slow or no Internet availability
  • Unapproved client access to OST file
  • Applications, for example, antivirus, file scanners and so on utilizing the OST file
  • Establishment of pointless add-ins, for example, Fax software that occasionally causes interference
  • The OST is being used by an application, for example, MS Exchange Server and other mail-empowered applications
  • Contrariness among Outlook and projects, for example, Lync, UCMAPI, Communicator, and so forth.

Solutions  to Resolve “Why I Cannot Access my OST File” Issue

If you can’t access  Outlook OST file, follow these solutions:

Solution 1: Quit all Microsoft related process

To do as such, execute the accompanying advances:

  1. Leave Outlook and open ‘Task Manager’ on your Windows framework.
  2. Go to the ‘Process’ tab and search for applications, for example, Lync, UCMAPI, and Communicator.
  3. Pick each in turn and select ‘End Task’

Solution 2: Remove Add-ins

To do as such, execute the accompanying advances:

  1. Open Outlook
  2. Go to File >> Options >> Addins
  3. In ‘Outlook Options‘ window, under Manage header, pick ‘COM Add-in‘ and click the Go button
  4. Evacuate the un-essential add-ins

Solution 3: Disable Exchange Cached Mode

To do as such, execute the accompanying advances:

  1. Go to Control Panel >> Mail >> Email Accounts >> Email.
  2. Pick the proper Email Id and click on the ‘Change’ that is available in the navigation bar.
  3. Check ‘Use Cached Exchange Mode’ to address errors in OST file
  4. Click on the Next lastly Finish.

Solution 4: Switch off the Compatibility mode

To do as such, execute the accompanying advances:

  1. Search the Outlook.exe
  2. Right-click on the Outlook.exe and select Properties choice
  3. Pick the Compatibility tab from Outlook Properties window
  4. Uncheck the ‘Run this program in Compatibility Mode’ checkbox


Solution 5: Run scanost.exe, which is an inbuilt device in Outlook to evacuate error in the Outlook offline data (OST) file and fix the damaged OST file


  1. Go to the folder where the Outlook.exe file is saved
  2. Find the scanost.exe file and double click on it
  3. Pick the Exchange profile from the list and click o the Repair Errors and afterward Begin Scan.

Read this : To Repair OST File in Outlook  2010 / 2013 / 2016 / 2019 versions.

Solution 6: Use a Enterprise Level Professional Software

Utilize a utility that can change over the inaccessible OST file into PST file format. Further, using Outlook’s Import/Export wizard, you can import the PST file in Outlook and access all the data items, for example, messages, connections, contacts, etc. You can utilize OST file Converter Tool, a very good quality business-tool to effectively change over the inaccessible or corrupted OST file into a usable Outlook PST file.

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You can follow these solutions individually and see which of these work in fixing Why I Cannot Access my OST File error. Be that as it may, in this relentless world, everybody wishes to get fast and successful outcomes in a direct manner. Nobody likes to move in an indirect way and postponement or hamper their business development. Consequently, it is proposed that you use OST file conversion tool that gives extra advantages and effectively convert OST file data  to Outlook PST. Along these lines, you can get to the OST file easily.