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What Causes ‘Exchange Server is unavailable’ Error? outlook must be online or connected), know the causes that result in this error. Nonetheless, before going through the different methods that you can use to fix the issue (the connection to the microsoft exchange server is unavailable. Thus, it becomes a necessity to fix this error as soon as possible. When this error comes up, you cannot access your mailbox and mailbox items stored on the Exchange server.
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The on-premise domain has correct DNS entries for AutoDiscover the Microsoft Remote Connectivity Analyzer connects fine.
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Adding Exchange account gives “The name cannot be matched to a name in the address list.” which is caused by Outlook being unable to find the user in Office 365.When the client is running Office 2016 or earlier, the problem does not occur.Client running Windows 10 with Outlook 2019, not domain joined.Server is onsite/local Exchange 2016 or Exchange 2019 without Office 365.The ADSIEdit data displayed for the affected user shows that the user is properly listed in the necessary Address Lists.The account is properly listed in the Global Address List, not hidden.While adding an Exchange account in Outlook 2019, you enter the email address and user credentials then receive the message “The name cannot be matched to a name in the address list.” The issue only occured with Office 2019 or newer. I had a user unable to connect to my on-premise Exchange server. Microsoft Outlook 2019 unable to connect to on-premise Exchange Server "The name cannot be matched to a name in the address list."
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