Livecycle Sharepoint connector is not supported with Adobe Livecycle ES. You will have to upgrade either to ES2.5 or to ES2 + SP2 + Sharepoint QF4 (QF = Quick Fix). I think ES2.5 is a better option, because you need to run only one installer.
But, yeah obviously if you want to get sharepoint connector with Adobe Livecycle ES only, then you will have to contact Adobe Enterprise Support for that.
I would like to know is that ES 2.5 is a separate product by itself or just like windows service packs we can install it for free.
For this you need to talk to Enterprise Support. I don't know much about licensing.
The best place to look for this is on the upgrade page on the Adobe website before you contact support.
ES2.5 is just a service pack on top of ES2, but it is a significant upgrade from ES.
Thanks for your reply, can i confirm that no additional licenses or hardware are required to upgrade from ES TO ES2.5 ?
Hw about the existing data and other configurations. Will there be any thing needed to taken care of ?
If you're on maintenance and support, you should have received information entitling you to an upgrade. I am not going to say that this is easy, as it depends upon your forms and, more importantly your processes and any Java code you have. In general, I'd suggest that you talk to whoever installed your system in the first place before you proceed through an upgrade. There are great benefits to moving to ES2 and beyond, but I would never call the process trivial.
I'd check out the upgrade section of the documentation at http://help.adobe.com/en_US/livecycle/9.0/documentation.html#task=2&module=-1
I'd also suggest looking at this article from one of our architects http://craigrandall.net/archives/2010/05/livecycle-es2-app-model/ which tells of one of the major architectural enhancements that came into ES2.
I'd consider making the jump to the new Document Services in ADEP; you can find informaton on ADEP and LiveCycle at http://www.adobe.com/solutions/customer-experience/enterprise-platform/faqs.html