If you are unable to send or receive email there are a few things to check before submitting a ticket:

Is Outlook Disconnected or Offline?

1. Check to see if Outlook is currently shown as Offline or Disconnected in the bottom right corner of Outlook
2. If it is, click on [Send / Receive] tab and disable [Work Offline]

Can you access Outlook Web?

1. Go to https://outlook.office365.com and login with your KRC network credentials.

Yes?

Then the issue most likely is related to your computer or Outlook software.  Try restarting your VDI desktop (not your thin terminal).  If this does not resolve your issue, please open a ticket.

No?

There should be a link to an error message.  Copy this message, open a Freshdesk ticket and paste this message into the box.  Typically these issues may be something affecting all users, or more frequently Microsoft accidentally deletes a license causing this issue.