FIX: Microsoft Outlook: The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

When you attempt to launch Outlook, you’ll receive below error during it loading the profile and doesn’t launch the Outlook:

 

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Microsoft Outlook
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The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.
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OK  
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Microsoft Outlook
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Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The file C:UsersgovardhanAppDataLocalMicrosoftOutlookGovardhan@govardhan.com.ost is not an Outlook data file (.ost).
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OK  
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Fix:

Clear all the existing accounts/profiles in Outlook:

Control Panel > User Accounts > Mail (32-bit)

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Ensure AppData key is existing and configured properly at below registry path:

HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders

 

 

 

 

Resources:

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p>Outlook: Unable to perform a Check Name or connect to an Exchange mailbox

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