OST Cannot Be Accessed Configured Different Mailbox Error

Microsoft Outlook creates OST and PST files to store mailbox data items. OST files play an important role when the Outlook user wants to work in offline mode. In case if there no Exchange connectivity or slow internet connection, this OST files allows working in offline mode. Once the connection gets established between the Outlook application and the Exchange server all the changes made in the offline mode will get synchronized. But sometimes When the user starts Outlook application or try to import or move the OST file, or attempts to access the OST file in newly created Outlook profile then sometimes the user has to face OST cannot be accessed configured different mailbox issue.


Hence in the upcoming section, I am going to tell you the reasons for this problem and the appropriate solution to fix this issue. Actually, one thing we have to understand first is that there is a key difference between the OST and PST file, the user can easily transfer the PST files to one machine to another and the user can easily open the PST files. But this doesn't apply to OST files. Before proceeding to the solution part to resolve this problem let us understand the reasons behind this OST cannot be accessed configured different mailbox faced by Outlook users.

Primary Reasons for This Error

Outlook OST files are tightly coupled to the account that they are configured with. So these files cannot be a move to a different machine. There are various causes of this error some of which are described below.

  1. If the user trying to access the OST file on a different machine.
  2. Another Exchange account with the same name and different credentials uses the same profile.
  3. If your Outlook data file is damaged or corrupted.

Ways to Resolve this OST Cannot be Accessed Configured Different Mailbox Error

  1. Login with the same username which you have used at the time of OST file creation. It should be cached login. After, start the Microsoft Outlook application and export the OST file data to PST file format.
  2. Log in as an administrator to take the ownership of the Outlook OST file and try to import.
  3. Ask your Exchange administrator to export the information from old Outlook OST file.

Important Note: If the user have corrupted OST file then the user can read this blog Scanpst.exe utility to repair corrupted OST files.

Expert Solution to Resolve OST Cannot be Accessed Configured Different Mailbox Problem

If the user won't be able to resolve the issue with the help of manual method then the user can try OST to PST converter utility to resolve this issue. This helps the user to migrate the OST file data to Outlook PST file format. In case if you have damaged or corrupted OST file then also you can use this utility. In addition, this software will also help the user to export the selected OST file data. This utility can easily remove and decrypt OST S/MIME and OpenPGP encrypted OST file emails. Moreover, this tool supports MS Outlook 2019 and its below versions. For complete info the user can try the free version of this software.

Time to Conclude

Microsoft Outlook errors are not limited to data file corruptions. Sometimes improper mailbox configurations are also responsible. So from the above write up one can get the ideas how to resolve OST cannot be accessed configured different mailbox error. The user can try the manual methods to resolve this issue. But in case if you won't be able to perform the manual method then taking the help of an automated solution is the best remedy to resolve this problem.