The Application Microsoft Outlook Cannot Be Opened

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Aug 02, 2021 Restart Outlook and check if the “cannot start Microsoft Outlook” issue is resolved. Reduce Outlook Data File Size. Outlook creates two types of data files on the local system - PST (for POP3 email accounts) and OST (for MAPI/IMAP accounts). If your Outlook data file has become large-sized, then it can create problems with your Outlook. Microsoft Office 2016 applications may crash or cannot start. The applications that have been seen to be affected are Excel, Outlook, Skype for Business, Word, Access, Publisher, Project and OneNote. Additionally, in the Application Event log, you may find a crash signature similar to the following in event ID 1000.

  1. Jul 28, 2021 My Outlook is not working. When I try to open it says: Microsoft Outlook cannot open. The Outlook Window and the set of Folders cannot be opened. Errors have been detected in the file. Can someone acc read more.
  2. Open SCANPST.EXE. Select Browse to select the Outlook Data File (.pst) you want to scan. If you need help locating your Outlook Data File, see Locating the Outlook Data Files. Note: By default, a new log file is created during the scan. You can choose Options and opt not to have a log created, or you can have the results appended to an existing.

Note

Office 365 ProPlus is being renamed to Microsoft 365 Apps for enterprise. For more information about this change, read this blog post.

Symptoms

When you try to start any Office for Mac applications (Microsoft Word, Microsoft Excel, Microsoft PowerPoint, Microsoft Entourage, or Microsoft Outlook for Mac) in Mac OS X 10.6.x (Snow Leopard), you receive the following error message:

Cause

This error occurs if the Office program was moved or duplicated.

The Application Microsoft Outlook Cannot Be Opened As A

Resolution

Step 1: Check the program path

When the error message is displayed, view the comments under 'Problem Details and System Configuration.'. Note the 'Path' that is listed in the error message, and then close the error message box. The path must be as follows:

Macintosh HDApplicationsMicrosoft Office 2008

Macintosh HDApplicationsMicrosoft Office 2011

If the path in the error message differs, you must move the application folder to its correction location. To do this, follow these steps:

  1. Locate the Office 2008 folder.
  2. Click to select the folder.
  3. On the Finder menu, click Edit, and then select Copy Microsoft Office 2008 or Copy Microsoft Office 2011.
  4. On the Finder menu, click Go, and then select Applications.
  5. On the Finder menu, click Edit, and then select Paste the Item.
  6. Start the Office program to see whether the problem is resolved.

If the problem continues to occur, there might be duplicate entries.

Step 2: Delete duplicate entries

To delete duplicate entries, follow these steps:

Microsoft Outlook 365 Login

  1. On the Finder menu, click File, and then click Find.

  2. In the search box, type the program name, and then press Enter. For example, type Excel.

  3. In the results, look for duplicate instances of the Excel icon. If there is only one icon, go to 'step 3'. If there are several Excel icons, select a duplicate icon. On the Finder menu, click File, and then select Move to Trash.

  4. Empty the Trash.

  5. Start the Office program. If the problem continues to occur, remove and then reinstall the Office program.

Step 3: Remove and then reinstall Office

Opened

Office 2011

To remove Office 2011, follow these steps:

  1. Quit all applications.
  2. In the Finder, click Go select Computer.
  3. Open your hard drive (Macintosh HD), then open the Application Folder.
  4. Click to select Microsoft Office 2011 drag and then drop it to the Trash.
  5. Reinstall Office for Mac 2011.

Office 2008

To remove Office 2008, follow these steps:

  1. Quits all applications.
  2. In the Finder, click Go, and then select Computer.
  3. Open Macintosh HD, then open the Applications folder.
  4. Open the Microsoft Office 2008 folder.
  5. Open the Additional Tools folder.
  6. Double-click the Remove Office file. The 'Remove Office' window will open.
  7. Click Continue.
  8. Follow the directions that are provided.
  9. Reinstall Office 2008 on your computer.

OST file is created when you configure Outlook with Exchange Server or IMAP account. OST file is the replica of the mailbox on the server and allows you to work even when there is no internet connectivity. However, sometimes, when opening the Outlook, you get an error message – ‘Outlook OST file cannot be opened’.

In this post, we’ll be discussing the solutions to fix Outlook OST file cannot be opened error.

Some Common Errors of Outlook OST File

There are various other errors that are also related to the OST file. Some of them are:

  • OST is in use by another application
  • Microsoft Outlook not responding
  • Default Outlook .ost is in use and cannot be accessed
  • Set of folders cannot be displayed

The Application Microsoft Outlook Cannot Be Opened Without

There could be various reasons behind such errors, such as Outlook’s abrupt shutdown, synchronization issue between Exchange Server and cached OST, malware infection, sudden power failure, etc. However, the common cause for such errors is corruption in the OST file.

Methods to Fix ‘OST File cannot be Opened’ Error

Here are some effective solutions to fix OST file cannot be opened error.

1. Relaunch the Outlook

Sometimes, simply restarting the Outlook helps resolve various issues. To try to fix the Outlook OST error, you can just close the Outlook program and restart it. Follow the below-mentioned steps:

  • Close the MS Outlook program.
  • Now launch the Task Manager and select the Processes tab.
  • Try to find the Lync, Outlook, Communicator, or UcMapi. If you find any of them, choose them and select End Process.
  • Restart your system and check if the error is resolved.

2. Disable the Cached Exchange Mode in MS Outlook 2016

You can disable the Cached Exchange Mode in your Outlook 2016. It may help fix Outlook OST cannot be opened error. Follow the below steps:

  • Close the MS Outlook program.
  • Go to the Control Panel and select the Mail option.
  • This will open the mail setup window, wherein you need to click on the Email Accounts option.
  • Now, select the Email tab. This will display the Exchange Account on your screen.
  • Select the email address and click on Change.
  • Next, uncheck the Cached Exchange Mode option.
  • Click Next and then click Finish.

Microsoft Outlook Email

3. Disable the Conflicting Outlook Add-ins

Sometimes, conflicting or faulty add-ins can cause various Outlook errors, including the Outlook OST cannot be opened error. If this is the case, you can disable the add-ins. To disable the add-ins in your Outlook 2016, you need to start it in safe mode. To do so, you can open the Run dialog box, type ‘Outlook/safe’, and then press Enter. Alternatively, you can follow the steps below to open Outlook in safe mode:

  • Navigate to the shortcut icon of MS Outlook application.
  • Double-click the application shortcut while holding down the CTRL key.
  • You will see a prompt. Click Yes to run the Outlook application in safe mode.

If the error is resolved, it means the add-ins are causing the issue. Now you can enable the add-ins one-by-one and restart the Outlook to find out which one is causing the issue. When found, you can disable the add-in permanently.

Outlook

Conclusion

The Outlook OST cannot be opened error may occur due to various reasons, such as faulty add-ins, synchronization issues, damaged or corrupt OST file, etc. However, you can easily fix Outlook OST cannot be opened error by following the methods mentioned in this post. In case the OST file becomes orphaned or inaccessible, you can use a powerful OST to PST converter software, such as Stellar Converter for OST to extract data from the file. The software can convert OST file of any size into PST file which you can easily import into any Outlook account.

Table of Content

Can't Open Microsoft Outlook On Mac

  • 2 Methods to Fix ‘OST File cannot be Opened’ Error