1.7 went EOS 30 September, 2008. A 2 year, fee based, "IBM Lifecycle
Extension for z/OS V1.7 (5637-A01)" (SHARE, Austin, JES3 project,
session 2700) does exist. 

The only supported releases are 1.8 - 1.10. 

Compatibility, coexistence, toleration (CCT) is guaranteed for n+2. 
Support is GA+3 years.

That being said, I have violated the n+2 (n+3 at the time) CCT rule.

You should still be able to get the 1.7-1.9 CCT PTFs. Put them on.
Be careful of the console restructure and protected user key CSA.
Use the 1.9 migration aid.
Verify your vendor products.

Review the 1.10 migration guide for big issues.

Do NOT run 1.7 and 1.10 simultaneously in a shared DASD environment.
Switching between 1.7 and 1.10 MAY work, be prepared to recover
catalogs. 

Do NOT use any new 1.10 features until 1.7 is history.

Good luck.

Dennis Roach
GHG Corporation
Lockheed Martin Mission Services
Flight Design and Operations Contract
NASA/JSC
Address:
   2100 Space Park Drive 
   LM-15-4BH
   Houston, Texas 77058
Mail:
   P.O. Box 58487
   Mail Code H4C
   Houston, Texas 77258
Phone:
   Voice:  (281)336-5027
   Cell:   (713)591-1059
   Fax:    (281)336-5410
E-Mail:  dennis.ro...@lmco.com

All opinions expressed by me are mine and may not agree with my employer
or any person, company, or thing, living or dead, on or near this or any
other planet, moon, asteroid, or other spatial object, natural or
manufactured, since the beginning of time. 

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