"0X800CCC13" error message when you try to send an email message by using a POP3 account or an IMAP account in an Outlook profile that has an Exchange Server 2010 mailbox configured

Applies to: Exchange Server 2010 EnterpriseExchange Server 2010 Standard

Symptoms

Consider the following scenario:
  • You connect to a Microsoft Exchange Server 2010 mailbox by using Microsoft Office Outlook in online mode.
  • You add an additional POP3 account or an additional Internet Mail Access Protocol (IMAP) account in the same Outlook profile. 
  • You create an email message that includes an attachment.
  • You select the POP3 account or you select the IMAP account as the sender, and try to send the email message. 
In this scenario, the email message remains in the Outbox. Additionally, you receive the following error message:

Task '<the POP3 account or the IMAP account> - Sending' reported error (0X800CCC13): 'Unable to connect to the network. Check your network connection or modem.'

Resolution

To resolve this issue, download and then install Exchange Server 2010 Service Pack 1 (SP1) from the following Microsoft website: 
Download Exchange Server 2010 SP1

Workaround

To work around this issue, access the mailbox by using Outlook in cached mode.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about email account types, visit the following Microsoft website:
General information about email account types