OS4X Release 2026-02-25 can be downloaded online from the website www.os4x.com/downloads, the OS4Xvirtual images and the Docker containers are updated.
Current changes are:
- OS4X Core:
- ⊕ New: A new parameter „AS2 Subject“ has been added to the event“End receive“ (also available in the WebAPI request).
- OS4X AS2:
- ⊕ New: The subject of AS2 transmissions can now contain variables which resolve to values of the corresponding send queue entry:

- ⊕ New: The subject of AS2 transmissions can now contain variables which resolve to values of the corresponding send queue entry:
As the latest version of OS4X available, we recommend to update to this version as fast as possible.