Outlook is an email client manager that let you manage your emails, contacts, meetings, tasks, to do list and much more. Outlook saves all the items in a separate file known as PST (personal storage table) file. Thus if any corruption issue occurs in PST then the whole data becomes inaccessible. And when you try to open any data you get the following error message:

“Cannot start Microsoft Outlook. Unable to open Outlook window”

Reason behind the occurrence of “Unable to start Microsoft Outlook” error message

  1. Damage to navigation pane files settings.
  2. Running outlook in compatibility mode.
  3. Using the older version of Outlook Profile
  4. Deleted or the damaged Outlook data file (.pst or .ost)

If you’re running the Outlook in compatibility mode or the data file is deleted or damaged because of improper un-installation or reinstallation or you are using the profile created in older Outlook version then you will find the above-given error message.

But whatever may be the reason that won’t let you open the Outlook window all you want is your data in accessible mode.

Also Read: How to Recover Deleted or Lost Emails?

Manual methods to solve this error:

After knowing the reason behind the error message the first thing you need to do is try to fix this issue as soon as possible.  In order to perform this action follow the given below steps:

– Wipe the Navigation pane file settings

– Recover configuration file of Navigation Pane

– Repair Outlook data files (.pst and .ost)

– Create a new profile on Outlook

– Turn off Outlook Compatibility mode

– Open the Outlook in a Secure Mode

How to Fix “Unable to open Outlook window” error?

Well after performing or using all the above-given steps if still, you are getting the error message or you are unable to access your data then the last option left with you is to use a repair tool. This is the only option left to repair and restore the data stored in it. Well, Outlook has an inbuilt repair tool known as

Well, Outlook has an inbuilt repair tool known as Scanpst.exe Tool but it can only fix the minor corruption issue but if the corruption issue is great then you need to use Outlook PST Repair Tool. With the help of repair tool, the user can easily fix up any sort of issue found in outlook. It can easily repair and restore corrupt and damaged data.

Guide to Fix “Unable to open Outlook window” Error?

Step 1- Download, install and run the software. After that ‘Select Outlook File’ dialog box will appear. If you know the location of the PST files then simply hit on ‘Select Outlook File’ button or hit on ‘Find Outlook File’ button to search the PST file.


Step 2- The path of the selected PST file will be displayed on ‘Select Outlook Data File (PST)’, hit on ‘Start ‘button to start the scanning process.


Step 3– As soon as the scanning process gets over it will display all the recovered mailbox folders. You can even preview the recoverable emails, contacts, journals, calendars, Tasks etc.


Step 4- Hit on check box which you want to recover and hit on ‘Save Recovered File’ placed in the top of the interface. After this, a dialog box will appear to give your desired folder to save your recover data. Hit on ‘Ok’ button.


Step 5- After that, the dialog box will appear with the detail of recovery data, ‘Destination path’ and ‘Recovered File Size’.


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