Is your Outlook showing "Disconnected" in the bottom right corner and you're connecting to an Exchange Server (not POP, etc.)?
All the following information is to be used at your own risk – I have successfully used all the below methods in production environments, and without issue. I cannot, however, speak for your environment. Please be sure to consult with your local IT support before acting on any of this advice.
Quick troubleshooting check list (detailed explanations follow):
1. Is the issue affecting multiple users or only one?
If multiple staff are affected, this blog can't help you [yet].
2. Can you ‘ping’ the Exchange server from the PC with the issue?
3. Check network cable / confirm access to other network resources is without issue
4. Try restart the PC
5. Is Outlook in 'Work Offline' mode?
6. Try setting Outlook to 'Work Offline' mode and then taking it out of 'Work Offline' mode again
7. Clear the PC's Local Security Log / Logs and then restart the PC
8. Try an Active Directory (LAN) account password reset / unlock / status check.
Make sure it hasn't expired / been suspended too.
9. Create a new Outlook profile via the 'mail' Control Panel and set it to the default
10. Try a 'Detect and Repair' from Outlook's Help menu or Repair Office via Add / Remove Programs Control Panel
11. Try disabling 'Cached Exchange Mode' (last resort and should only be used as a workaround until proper resolution is found)
12. Call Microsoft support in your country
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