Very odd one. Appears to be from the upgrade to Windows 10 people are reporting. I’m sure I installed Office 2010 after Windows 10 was installed so shouldn’t of caused an issue.
But anyway. E-mails will just sit in the Out box and never send with errors such as:
Sending reported error (0x800CC13) Cannot connect to the network. Verify your network connection or modem.
Being throw back.
Simple fix in the end it appears. Run CMD as Admin and type sfc /scannow
Once scan is finished it appears to fix the issue.
Press windows key an x to get an admin user command prompt
then
type
sfc /scannow
http://oit2.utk.edu/helpdesk/kb/entry/366/
Any one of the following will prevent email notifications from being sent:
You have added a Delegate and selected ‘Send meeting requests and responses only to my delegates, not to me’. (e.g., Tools | Options | Delegate).
You have your calendar set to auto-accept meeting requests.
You set ‘Author’ permissions on your calendar. This allows a person to open your calendar by choosing ‘Open a Shared Calendar’ and schedule a meeting directly on your calendar. Therefore, no email notification is sent.
OR
Check the e-mail sort you may have set, that can end up putting all the calender notifications at the bottom of all your e-mails.