@fbartels i testet the ISO yesterday and it seem to be nearly full EWS. But there were some crashes and the support costs are nearly double of Kopanosupport.
just browsing through the Linode page it is not 100% clear to me what the mentioned service includes. If you manage to convince the Linode team to setup and maintain (what is imho the definition of a “managed service”) your Kopano installation for you it should work.
This is based on Konnect, but also gives some more gui operations for configuration. The Kopano Konnect app from the appcenter will not be made public anymore.