If automatic subscription fails (for example, if you use a different calendar application than what your browser suggests), you will need to subscribe manually.
On the Kalender page, select a calendar you like.
Click Wählen.
If you are not logged in to WebCal.Guru, you will not be able to modify subscription settings and you will have significantly smaller selection of calendars. In this case, jump directly to Step 4.
Adjust the subscription settings if needed and click Zu meinen Kalendern hinzufügen.
You will be taken to Meine Kalender page. On the calendar you just added, click next to Herunterladen and select Adresse in die Zwischenablage kopieren.
Open the Outlook application and make sure you're on the Home tab.
Open the Addmenu and select From Internet…
Click Yes.
Updated 8 Feb 2023