Are you still dependent on CICS/VSE ?
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Still a hot topic is the old CICS/VSE 2.3. I had a related blog entry in February 2013, see here.
Some customers are dependent on CICS/VSE because their or vendor applications are not yet adapted to run on CICS TS for VSE/ESA 1.1.1.
A short summary about CICS/VSE and the use on z/VSE 4.3:
When z/VSE V4.3 became generally available on 26 November 2010, the installation and run-time support for CICS/VSE V2.3 changed significantly. There are some changes that you need to be aware of when upgrading to z/VSE 4.3. IBM recommends that you migrate your CICS/VSE V2.3 applications to run on CICS TS for VSE/ESA before you migrate to z/VSE 4.3 or later releases or versions. z/VSE 4.3 is the last release that can be used as the run-time environment for CICS/VSE 2.3, but this is subject to restrictions on the use of CICS/VSE and DL/I and the successful execution of applications as documented. CICS/VSE 2.3's support ended on October 31, 2012.
CICS/VSE 2.3 can not run on z/VSE 5.1.
See the following web pages for more details: