Solve Unable to Expand Folder Error of OST File

“I often work on my Outlook in offline mode i.e. when there is no internet connection. I never used to encounter any issues while working OST file. But, today when I tried to open the OST file, there was an error message ‘Unable to expand the folder’. I don’t understand where the problem is and all my mail items are not reachable now. How can I fix this error in Outlook OST file? Please suggest me any suitable suggestion.”

There are many users who encounter various error messages while accessing Outlook OST file. OST is an offline folder which will be saved with .ost file format on the system drive similar to PST file. Any changes made to the OST file will be updated in Exchange Server when network gets connected by syncing the data with Exchange Server. But, there are many circumstances that can bring on many errors when you try to access OST file and above mentioned is one such error.

Error: Unable to expand the folder …

Often this error message is displayed with Microsoft Outlook that has multiple profiles / user accounts. It can appear due to causes such as OST file corruption, incorrect Outlook email account settings and incorrect mail profile. Usually users undergo a number of events while creating a new profile on their Outlook. During this process, any simple mistake in the settings will cause damage to the file and thus below listed error message gets displayed:

Sometimes, these error messages can also occur when Folder Visible option is not set for second mailbox and when proper permissions to access the folder in the mailbox are not assigned.

How to fix Unable to expand folder error of OST File?

To fix such error messages in Outlook OST file, turn on ‘Folder Visible’ option for mailbox. Thinking how to turn on this option? Then follow these steps:

If you are still facing same error with OST file, then try to use inbuilt repair utility Scanost.exe and repair OST file. Many a times, all types of errors associated with OST file can be fixed by running Scanost.exe. If this integrity tool is giving no results, then the only method to fix OST file error is to convert OST file to PST file using reliable third party OST to PST Converter utility.

Best solution to get rid of OST file error:

One of the most eminent ways of fixing OST file error: “unable to expand folder” is by utilizing Yodot OST to PST Converter tool to convert OST file to PST file. This tool genuinely fixes all issues related to Outlook OST file by converting it to PST file format, so that there won’t be any loss of emails and other attributes from your mail account. You can utilize this tool to fix damaged / corrupted OST files that are encrypted and password protected. The software can convert OST files associated to Microsoft Exchange versions 5.0, 5.5, 2000, 2003, 2007 and 2010 on all major Windows operating systems like Vista, XP, 7, etc.

Steps to convert error showing OST file to PST:

Important Note:

  • Follow proper methods to share and create new profiles on Outlook OST
  • While sharing Outlook folders, provide reliable commands without making unnecessary mistakes
  • Prior to performing any changes to Outlook OST file, have sufficient knowledge on how to use the tool

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