Your Server or Mailbox names could not be resolved. Outlook must be online or connected to complete this action. The connection to the Microsoft Exchange Server is unavailable. When you try to create a new Outlook profile for a mailbox on a server that's running Exchange 2010 or Exchange Server 2013, you may receive the following error messages: However, you only see two connections within the 'Microsoft Exchange Connection Status' and you may see the Type Directory displayed as Disconnected/Connecting. Outlook starts and you can send and receive email messages. Outlook starts in the Disconnected state (the lower-right corner of the Outlook windows displays 'Disconnected,' the screenshot for the state is shown below). You may experience the following symptoms: However, if you're using a cached mode profile, Outlook doesn't display an error. Check to make sure you are connected to the network and are using the proper server and mailbox name. The information store could not be opened. Unable to open your default e-mail folders. Either there are network problems or the Microsoft Exchange Server computer is down for maintenance. The Microsoft Exchange Server computer is not available. When you start Microsoft Office Outlook by using a profile that includes a mailbox on a server that's running Microsoft Exchange Server 2010, Exchange Server 2013, or Exchange Server 2016, you may receive the following error messages:Ĭannot start Microsoft Office Outlook. Contact Support to confirm which Lync server your account is using.The article only applies to the Microsoft Outlook connection issues that are caused by the RPC encryption requirement. *Domains that were recently upgraded from Exchange 2010 to Exchange 2016 are still using Lync 2010 servers which are not compatible with Skype for Business for Mac and Skype for Business Mobile.

Read Knowledge Base article on How Can I Connect To My Exchange Server Using POP Or IMAP? for more details. Thunderbird, Windows Live) can be connected to Exchange mailbox only via POP/IMAP protocol. Any mail clients on Windows XP are not supported. Outlook 2003 and Mac Mail on OSX earlier than 10.6 (Snow Leopard) are no longer supported.

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