Frage zu JT400 und "in-service release"

[Pikachu]

Hört sich an nach "unter Wartung" ... >> IBM i Release support <<

Newer versions of the Toolbox are backwards-compatible with earlier
versions. Upgrading to a newer version is usually recommended, with the one
main exception being that the Toolbox is only supported for connection
to servers running an in-service release of i5/OS or OS/400.


Was ist mit "in-service release" gemeint?