Welcome to the forum, Morten.
If you're using the Lite version, isn't possible.
Using the Pro version, you can access a shared network calendar using webcal protocol.
Here are some references to export from WLC to an ICS file: help.outlook.com/en-us/140/gg603692.aspx
Remember to try before you buy! You can install and test the Pro version before you make the decision. The Pro version is fully functional even without the license except that events from network, Outlook and Google calendars will have string [Unregistered] in front of them.