This article contains information about common error messages in Microsoft Outlook, as well as tips to resolve the issue. Some errors and error messages you may encounter while using Microsoft Outlook include the following messages below.

“Cannot send this item.”

“The destination email address is unrecognized.”

This error message typically deals with how an outgoing email message has been formatted. If you encounter this message, check the To: field of the message first to ensure that the recipient’s address is correct.

This error can also occur when there is a problem within HTML-based email messages. Changing the outbound message’s format to plain text or rich text should resolve this. Visit Microsoft Support to find out how to change the message format.


“No connection could be made because the target machine actively refused it.”

“The server could not be found.”

“Error 0x800CCC0F.”

If you receive this message, first make sure that your computer still has an active network connection. To do this, simply click your computer’s wireless icon to see which Wi-Fi network –if any– it is connected to.

If you have verified that you are connected to a network and are still experiencing issues with Outlook, make sure that there are no permissions issues interrupting your ability to send emails. Occasionally, a blocked firewall port or over aggressive antivirus software can cause this error, so if this is the case, try unblocking the firewall port or scaling back your antivirus’s protections (at least temporarily).

If you have fixed any problems with your connectivity, firewall, or antivirus and are still having problems, delete and recreate your Outlook profile.


“Outlook not implemented.”

You may receive this error message when you try to open Microsoft Outlook. It indicates that Outlook cannot open because it has been damaged. How you repair Outlook depends on which versions of Outlook and Windows you are using.

Outlook 2013 on Windows 7

1. Go to Programs.

2. Go to Programs and Features.

3. Select Microsoft Office.

4. Click Change.

5. When the Office 2013 splash screen appears, choose Repair and follow the prompts.