READ_COMMITTED_SNAPSHOT support in SQL Server 2005 Express I wonder if SSE 2005 supports the READ_COMMITTED_SNAPSHOT database option. What I found is this article: Features Supported by the Editions of SQL Server 2005. It states that SSE 2005 supports Snapshot Isolation Level (Row-level Versioning), but doesn't support Database Snapshot.

Does it mean that READ_COMMITTED_SNAPSHOT is not supported? Or it is about some other database snapshot feature?
Yes from that link it supports it. A Database Snapshot is a read only "frozen in time" (when the snapshot was taken) view of data. This is a tool useful in some  recovery, reporting and rollback preparation scenarios.

The isolation levels you are asking about are all covered by the line talking about Snapshot Isolation Level (Row-level Versioning).

I would question what sort of workload you are putting against SQL Server Express that needs a snapshot isolation level as there are other restrictions on SQL Server Express that tend to make it not a great fit for busier, high concurrency apps (Most notably database size and memory restrictions) but this is certainly supported from that edition features matrix you linked.