Actually much of this is not true.
* All Neo4j versions have caching
* Neo4j Enterprise is available for free for any AGPL project and for personal use and early startups
* Neo4j is not an in-memory database, it is a persistent, fully transactional database, it uses the available memory for caching the hot dataset
I was actually referring to the "High-Performance Cache" mentioned in the feature matrix.
> Neo4j Enterprise is available for free for any AGPL project
I was really talking about a commercial setting. How many companies deploy a fully open-source project (ie., honouring the requirements of the AGPL) in a redundant data center? Not a lot, I imagine.