Unable to Expand Folder in Outlook 2007: How to Resolve the Issue?

Several people have updated their email-client application to MS Outlook 2007 so as to enjoy enhanced features and functionalities. Using this application you not only perform email operations successfully but also manage your personal data in much efficient manner. But corruption occurs in any case and so problems also arises. Corruption of PST files are quite common and usually gives rise to several types of errors. Once such PST file error is shown blow:

"Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file xxx.ost. Quit all mail-enabled applications, and then use the Inbox Repair Tool."

Unable to expand folder is very common error in earlier versions of Outlook but some of the users have also reported this error in Outlook 2007 also. It generally appears in the case when you attempt to add another mailbox in Outlook folder list and double click it to open a shared folder.


Reason Behind the Error

Usually, unable to expand folder error appears in Outlook when you haven't set the "Folder Visible" option for your second mailbox. If you haven't provided proper permission access to the Outlook folder then also this very error appears. So, in order to fix this error you need to you need to sort out the issues.

How to Fix Unable to Expand Folder in Outlook 2007 Issue

In order to resolve this error it is necessary that you should turn on the folder visible option for mailbox that you want to share. In few simple steps you will be able to do it. After doing this you will be able to fix the issue but even if you are getting similar problem again and again then it might be possible that there could be any corruption issues. So, you need to repair the corruption using third-party Outlook PST Repair Software. With the help of advanced software you will be able to repair and restore damaged PST files.