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?
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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: