Unable to expand the folder

I am getting "Unable to expand the folder.  The set of folders could not be opened".
and, on the system tray, I am seeing 'X' mark on Outlook icon.
How do you troubleshoot?
ethanjohnsonsAsked:
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war1Connect With a Mentor Commented:
Are you using an Exchange server?  If not, then your PST file may be corrupt.

Recover Damaged Outlook PST File
ScanPST
http://www.emailaddressmanager.com/outlook/repair.html
OR
Outlook Recovery
http://www.officerecovery.com/outlook/index.htm   Demo recovery

If no joy, your OST file may be corrupt. HideTo scan and repair the .ost file

   1. Close Outlook.
   2. On the Start menu, click Run.
   3. In the Open box, type

      drive:\Program Files\Common Files\System\Mapi\LocaleID\scanost.exe

      where LocaleID is the locale identifier (LCID) for your installation of Microsoft Office. For example, the LCID for English (United States) is 1033. For a list of LCIDs, see Microsoft Office Help.
   4. Click OK.
   5. Click either Scan all folders or Choose folder to scan. If you click Scan all folders, this may take several minutes.
   6. Select the Repair errors check box.
   7. Click Begin Scan.

Details of actions performed during the scan and repair are saved as a message in your Outlook Deleted Items folder with the subject "OST Integrity Check."

If the Offline Folder file cannot be repaired, you can disable it and create a new one.
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war1Commented:
Greetings, ethanjohnsons !

What are you doing when you get this error message?  Are you using an Exchange?

See if the following articles will help you solve the problem:

You receive an "Unable to expand the folder" error message when you add another mailbox to Microsoft Exchange Server service in Outlook
http://support.microsoft.com/?kbid=237825

"Unable to display the folder" or "Unable to expand the folder" error message when you use Outlook to access your mailbox in Exchange 2000 Server or in Exchange Server 2003
http://support.microsoft.com/?kbid=839531

Best wishes!
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ethanjohnsonsAuthor Commented:
I am using Outlook 2003.  My main in and out e-mail box works fine, but not Address Book, other e-mail boxes that are under my account, etc.
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ethanjohnsonsAuthor Commented:
They worked fine until yesterday.  I don't remember any significant changes I made.
Would it be something to do Exchange Server?
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ethanjohnsonsAuthor Commented:
PST seems ok:


Microsoft (R) Inbox Repair Tool
Copyright (C) Microsoft Corp 1995-1996. All rights reserved.

**Beginning NDB recovery

  **Attempting to open database

  **Attempting to validate header

  **Attempting to validate AMap

  **Attempting to validate BBT

  **Attempting to validate NBT

  **Attempting to validate BBT refcounts

  **Attempting to validate header NID high-water marks

**Beginning PST/OST recovery

  **Attempting to recover all top-level objects

  **Attempting to walk all folders

  **Attempting to locate any orphaned folders/messages

  **Attempting to check top-level objects for consistency

  **Updating folder hierarchy

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ethanjohnsonsAuthor Commented:
C:\Program Files\Common Files\System\MSMAPI\1033\SCANOST.EXE returns:
"You must be working online to use this tool".  In fact, I opened Outlook though.
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ethanjohnsonsAuthor Commented:
I figured it out.
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war1Commented:
ethanjohnsons, glad the problem is fixed.  What turned out to be the cause of the problem?
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ethanjohnsonsAuthor Commented:
>> I am seeing 'X' mark on Outlook icon

A sort of user error.   It had to be set as 'Online'.
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