If Outlook stops working whenever you connect to a VPN on Windows 11 there are quite a few potential issues you might have to deal with. Some VPN services and their connections are more problematic than others so you will need to try some different configurations until you find one that works. So follow along as we guide you through each of those checks.

Takeaways:

  1. Why can't I use Outlook with a VPN on Windows 11?
  2. Fix Outlook not working whenever I connect to a VPN network.

Does Outlook Work With a VPN?

Outlook generally works without problems on a VPN connection. However, VPN settings, protocols, server locations, and firewall restrictions sometimes cause issues with Microsoft services. That said, most issues can be fixed by changing servers, enabling split tunneling, or switching VPN protocols.

How to Fix Outlook Not Working With a VPN on Windows 11

Sometimes the issue is not related to your VPN at all. Microsoft services occasionally experience outages or temporary server problems that prevent Outlook from syncing emails. So check this before you do anything else in this guide. If servers are down no amount of troubleshooting on your end will help.

One of the most common causes is the VPN server location itself. Some VPN IP addresses are heavily used and may be flagged by Microsoft security systems. In other situations, the selected server may simply be overloaded, resulting in slow speeds or unstable connections. Some connections will even trigger Microsoft to lock your account. If this happens you will have to jump through steps to gain access again.

How to Change VPN Location

  • Open your VPN application.
  • Disconnect from the current server.
  • Connect to a different country or region.
  • Restart Outlook and test the connection.

Choose a reliable location close to your region whenever possible. Keep in mind that server loads can cause issues so don't use a server that has heavy usage.

Enable Split Tunneling

If changing servers does not work, enabling split tunneling is worth a shot. Split tunneling allows specific apps to bypass the VPN while the rest of your internet traffic continues using the encrypted connection.

How to Fix Outlook Not Working With a VPN on Windows 11

Exclude Outlook From the VPN

  • Open your VPN app settings.
  • Go to Connection or Advanced Settings.
  • Find Split Tunneling.
  • Enable the feature.
  • Add Outlook or Microsoft Outlook to the exclusion list.

After enabling split tunneling, Outlook will connect directly to the internet instead of routing traffic through the VPN.

Change the VPN Protocol

VPN protocols affect how traffic travels across the network. UDP-based protocols are faster but are more likely to be blocked by corporate firewalls or network security systems. TCP-based protocols are slower but more compatible with restrictive networks. Just try both and use the one that actually works. It's a dice roll most of the time.

Switch to OpenVPN TCP

  • Open your VPN application.
  • Go to Connection Settings.
  • Locate Protocol Settings.
  • Change the protocol to OpenVPN TCP.
  • Reconnect the VPN.

If you already use OpenVPN TCP, try switching to another protocol such as WireGuard or your VPN provider’s custom protocol. I've found that WireGuard seems to be the most stable one to use for most things.

Reinstall the VPN Application

If you are using a VPN app just uninstall and reinstall it again. Don't use free VPNs either as they aren't safe. Finally check to make sure that you have an active VPN subscription and that it hasn't expired. I've forgotto renew mind a few times and ended up wondering why things weren't working.