Hi,
I need a web part similar to the Group Calendar web part, but it should be able to show an aggregated view of multiple group calendars.
I found and followed the article Add and use an Aggregated Business Calendar Web Part in Duet Enterprise 2.0.
I did enable the Aggregated Business Calendar in the Site collection features.

But when adding a web part to a page in that site collection, there is no category Duet Enterprise and also no Aggregated Business Calendar web part. I waited a day after enabling the feature to make sure that it's not a sync or replication issue.

Any ideas why this doesn't work?