Skip to main content

Fix Error “OST is in use and cannot be accessed”- Complete Guide

Summary:- OST file is an file of Outlook which is used to store the copy of mailbox item. But sometime OST file has to suffer from the error “OST is in use and cannot be accessed”. And there are techniques available that can help you to fix Outlook errors. You can also solve this issue by doing the conversion of corrupted OST file into PST format with SysInspire OST to PST Converter Software.

Microsoft Outlook is one of the most highly used email platforms by many organization. The OST file format of MS Outlook saves a replica of Exchange Server mailbox on the system of the users.

Users can see the error OST is in use and cannot be accessed when the user tries to access there file. This error means the OST file that users want to open is using by any another application.

Quickly fix OST is in use and cannot be accessed error

  • Go with the SysInspire OST to PST Converter software that can fix OST file error in a few click without any difficulty.
  • Here you can get the Free Demo Version of the software.

Reasons behind OST is in use and cannot be accessed

So here are the most common reasons the outlook OST cannot be opened error :-

  • Synchronization problem between OST file and Exchange Mailbox
  • Many users trying to open the same OST file
  • Improper internet connectivity
  • Also the common reason is when unauthorized user open the OST file

Manual Method to Fix OST cannot be opened Error

Follow the below steps to fix outlook ost cannot be accessed error manually:-

  • Firstly you need to shut down the MS Outlook application
  • Next open the Control Panel
  • Then go to Mail and Email Accounts > Email
  • Now select the required email id and tap on the change
  • Here unselect the Use Cached Exchange Mode button
  • In next window tap Next and finish and you are done.

Fix Outlook Error via Professional Tool

If you are facing any difficulty while using the manual method then you should try this SysInspire OST to PST Converter. The software has a user friendly interface so any type of non-skilled person can operate this software.

free ost to pst

The software firstly scans the OST file selected by the users and convert OST to PST with data integrity. And if you firstly want to test out the software functionality then go with its free demo version. And after satisfying with the performance of the software you can purchase the premium version of the software.


Besides having advanced features the Outlook has to suffer from the OST is in use and cannot be accessed error. So here we listed the both automated and manual techniques to fix this error. And you don’t need to be worried about the SysInspire OST to PST Converter it is 100% virus free software.

Get the solution related to below queries:-

About SysInspire

SysInspire Software always designed product to help clients relating to Email Conversion, Data Migration, Forensic Tool and many more..

  • 2764 Pleasant Road Suite A PMB 916, Fort Mill, SC 29708 (USA)
  • support[@]sysinspire [dot] com