The name cannot be resolved, the connection to Microsoft Exchange is unavailable (Outlook 2010 client)
![Outlook connection issues with Exchange mailboxes because of the RPC encryption requirement - Exchange | Microsoft Learn Outlook connection issues with Exchange mailboxes because of the RPC encryption requirement - Exchange | Microsoft Learn](https://learn.microsoft.com/en-us/exchange/troubleshoot/exchangeserver/client-connectivity/media/outlook-connection-issue-caused-by-rpc-encryption-requirement/exchange-encryption.png)
Outlook connection issues with Exchange mailboxes because of the RPC encryption requirement - Exchange | Microsoft Learn
How to fix Outlook to The connection to Microsoft exchange is unavailable. Outlook must be online or connected to complete this action- Internal connect
![Exchange 2010 – Outlook Anywhere – Outlook is unable to connect to the proxy server. (Error Code 10) | FICILITY.NET Exchange 2010 – Outlook Anywhere – Outlook is unable to connect to the proxy server. (Error Code 10) | FICILITY.NET](https://ficilitydotnet.files.wordpress.com/2013/02/outlookproxycert1.png)