my question: when Nextcloud (server) is not updated and the client is automatically updated will the client still sync?
I have some owncloud installs where the syncs are stopped, due to the fact that the client states that the version of the server is “too old” - that is about 2 years.
If nextcloud does not block syncs then I will convert those installs to nextcloud and not update to oc 10.
Can clients be mixed during the move to nextcloud?
They probably keep the sync functionality for all supported server versions. But I doubt that ownCloud didn’t do this as well. However, the community versions are “only” supported for 1 year, but with enterprise support you can get up to 10 years of support (https://nextcloud.com/pricing/), that certainly includes the clients.
The clients were compatible, recently ownCloud clients started to trigger a warning on NC servers but I could still ignore the warning and syncing worked.