z/VSE 5.1 is now no longer in service
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The z/VSE 5.1 end of service date was June 30, 2016. That is z/VSE 5.1 is unsupported since today. z/VSE 5.1 was in service for about 4.5 years, a long time.
We will provide the last z/VSE 5.1 Recommended Service Level (RSL) in a few weeks. It includes the latest PTFs for the z/VSE 5.1 products. Existing PTFs can still be ordered.
If you want to stay in a supported environment, please upgrade to a supported release. You may Fast Service Upgrade (FSU) from z/VSE 4.3 and z/VSE 5.1 to z/VSE 5.2 or do an initial installation with z/VSE 6.1. z/VSE 5.2 requires a z9 or higher, z/VSE 6.1 a z10 or higher. z/VSE 5.2 can still be ordered until March 13, 2017.
If you order z/VSE 6.1, please make sure, that you get a new license and key for IBM TCP/IP for z/VSE 2.1 (if you use that TCP/IP version).
You may use the Migration Pricing Option (MPO), if you migrate to z/VSE 6.1. More information is here.
We also provide a "z/VSE Release & Hardware Upgrade" paper on the z/VSE documentation page - here. We will update that paper on request. That is please let us know, if we should change anything - or add new information.