OST files are Exchange offline folders that permit users to maintain the continuity of their work even without the connection of Outlook client to Exchange Server. In short, users can access files in offline mode. In fact, it allows creating new emails, saves them in drafts, reading or deleting emails etc. After establishing the connection, the changes automatically gets synchronized with the live Exchange Server.

But, there come times when users encounter unable to expand the folder error message
errors due to improper OST synchronization. These synchronization failures are highly undesirable circumstances in large IT organizations who use Microsoft Outlook for communication.

unable to expand the error message

This is one of the most common error messages encountered during the OST synchronization procedure.

Unable To Expand The Folder Error Message – Know The Reasons

Often this error message occurs with Microsoft Outlook that has multiple user accounts/ profiles. The error implies issues with OST file and after this error synchronization of OST file with Exchange Server cannot be done. There are several factors that may result ‘Unable to expend the folder’ error message and some of them are the following:

  • Synchronization problems between OST and connected Exchange mailbox.

  • Conflicts between applications and Microsoft Outlook.

  • Multiple users attempting to access the same OST file.

  • Unreliable network connection or poor connection.

  • Unauthorized accessing to OST file.

  • Activities like LYNC, UCMAPI.EXE, Office Communicator 2005/2007 etc., are running in the background.

How To Fix Unable To Expand The Folder Error Manually?

After taking a closer look at the error message, you will find that it is stating that close all the mail-enabled programs that can use OST data file.

  1. First of all, you need to find the OST file.

Note: By default, OST files are stored on any of the following locations:


drive:\Documents and Settings\\Local Settings\Application Data\Microsoft\Outlook

2. Now, run the Inbox Repair Tool (Scanpst.exe) to repair Outlook OST.

3. After this, simply recover the repaired data items.

Sometimes, OST file errors cannot be fixed just via running the Inbox Repair Tool. Hence, if this inbuilt repair tool becomes unable to fix the error then, the only solution left is taking help from a trusted third-party tool.

Expert Solution to Resolve Outlook Error Unable to Expand the Folder

Corruption in the OST file is the main cause of this error message and the OST File Repair Tool is the best way to repair corrupted or damaged Outlook data files. It has the ability to rebuild and restore OST file in multiple file formats like PST, EML, MSG, HTML, and Office 365. The software is designed with highly programmed algorithms so that it can decrypt the OST file emails just by removing S/MIME and OpenPGP encryption. With the help of this software, users can recover deleted emails, contacts, calendars, and all other data items stored in OST. If users want to export the data of a specific time period then, this also can be done with this tool as it provides Date Filter option. It keeps the Metadata of emails like Read/ Unread Status and Message Dates. Using this, one can recover both compressible as well as highly encrypted OST files. The best part about this software is that it does not impose any file size limitations.

Observational Verdict

This technical page comprises complete information about unable to expand the folder error message of Microsoft Outlook. Besides, we also have disclosed some simple and cost-efficient solutions that can fix this error in a few simple clicks. Hence, from now it will become no more difficult for users to resolve such Outlook errors.

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