I have Magento community edition 1.5.1 and I want to upgrade to Enterprise Edition 1.12 or later.
Is it possible to upgrade from CE to EE directly without any intermediate step?
Thanks
No. There is no magic button to do this.
It involves 2 part: first - upgrade your community to the latest version . (each community version has its corresponding enterprise version, if you like to keep an old version , then just skip it)
second - migrate community to enterprise
As DB schema is different, and depends on your customization, it is much safe to follow approach: