I have close to 18000+ (SEP 11) clients that still need to be migrated / upgraded to SEP 12. Symantec has indicated that SEP11 will no longer receive updates from Jan 2015.

If I change the comms to point all the SEP11 machines to the current SEP 12 SEPM - will they still receive updates from the SEP 12 manager even after the End of life date for SEP 11 or not . And if Yes, I am guessing only AV and PTP would be updated?

SEPM 12.1 has separate defs for 11.x and 12.1 so once they stop it shouldn't matter what SEPM they're pointing to.

Check if it helpful thread

https://www-secure.symantec.com/connect/forums/sep11-clients-win2000-not-upgrading-sep121-server

Is there any documentation to support this?

Will the intelligent updater still work with SEP 11 even though end of life for SEP 11 after Jan 2015?

What do EOLS and EOSL mean for Symantec Endpoint Protection 11.x customers?

EOLS means that as of January 5, 2014, no new versions of Symantec Endpoint Protection 11.x are under development or are planned for release. All support services, including without limitation, bug fixes/patches and engineering modification, for Symantec Endpoint Protection 11.x will end on the EOLS date. Content (virus definitions) will be provided until January 5, 2015, but will not support Windows Fundamentals or PowerPC as of January 5, 2014, or Windows 2000 as of September 27, 2014.

EOSL means that as of January 5, 2015, all support services, including technical support, are no longer provided for Symantec Endpoint Protection 11.x. This is the end of the product life cycle.

http://www.symantec.com/business/support/index?page=content&id=TECH207274

Support life extension for Endpoint Protection 11.x and Endpoint Protection Small Business Edition 12.0.x

Article:TECH211491

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Created: 2013-10-11

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Updated: 2014-04-14

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Article URL http://www.symantec.com/docs/TECH211491

Check the link for update

http://www.symantec.com/security_response/definitions.jsp?pid=sep11_32

http://www.symantec.com/security_response/definitions/download/detail.jsp?gid=sep

See below thread

https://www-secure.symantec.com/connect/forums/sep11-eol-and-definitions

https://www-secure.symantec.com/connect/forums/need-more-information-eol

After Jan 5, 2015, content for 11.x stops. so no, Intelligent Updater will not uopdate 11.x clients.

Hi,

It's strongly recommended to upgrade the clients to the latest version of SEP. You have sufficient time to plan upgade of 1800+ clients. Actual update can require as little as fifteen minutes; however, depending on the level complexity within your environment, the testing process, and stages of deployment, some customers have spread the migration process over several weeks or months.

You should check more info on this part with your partner or reseller.

16. What kind of Support Services does Symantec provide for an EOL’d product or version? 
Once the version reaches its EOL we change the nature and scope of support services for that product. Please refer to our End of Life Policy for Business Products which can be found at: 

http://www.symantec.com/content/en/us/enterprise/other_resources/b-end_of_life_policy_for_business_products.en-us.pdf

The product or version will move through a Limited Support phase and then a Partial Support phase. When the Partial Support phase ends, the product or version reaches its End of Support Life, and Symantec ceases to provide any level of support services. Keep i n mind that this FAQ describes our typical guidelines, and that the type and length of support services deliverables for a specific product version may vary from the guideli nes described in this FAQ. Your Symantec branded technical support agreement covers the GA version of your product license. If you have a current Symantec branded technical support agreement in effect, and you are using a product versi on that has reached EOL, we wil l provide the level of support for your EOL’d product version based on where it is in its life cycle, as described in our EOL announcement. 

Reference: http://www.symantec.com/docs/TECH76123