Yes, per this link

http://www.symantec.com/business/support/index?pag...

A Symantec Endpoint Protection Manager (SEPM) with version 12.1 can successfully deploy, administer and update SEP 11 clients, if necessary.  This mixture of versions is usually a temporary condition as endpoints in the organization are upgraded to SEP 12.1.  In the case of Windows 2000 Server or Windows 2000 Professional endpoints, it may be necessary until computers running the legacy OS are retired.

Hello , 

• SEP 11 clients can be managed by a SEP 12.1 SEPM.
• SEP SBE 12.0 clients cannot be managed by a SEP 11 SEPM.

Please check out the below link for more information,

Can Symantec Endpoint Protection 11 Clients Be Managed by Symantec Endpoint Protection Small Business Edition SPC/SEPM?

http://www.symantec.com/docs/TECH93737

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Hi,

U mean sep11 client can be managed by sep 12

Yes it can be and it has been discussed several times on Forum. Please check these Threads:

https://www-secure.symantec.com/connect/forums/sep...

https://www-secure.symantec.com/connect/forums/sep...

For your documentation, please find below link:

http://www.symantec.com/business/support/index?pag...

Thanks to those that responded. As far as the first responder goes I thought my question was precise enough and from the looks of things the others responders did not have issues with it. As far as this being discussed on the forums that was not enough I need a HOWTO document that could be presented to management. Just listing to chit chat on these boards was not going to be enough. Apparently I was not clear enough in asking my question.