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)
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
