Zope X3 was the first release of Zope 3. The X signified that it was not backwards compatible with Zope 2. In 2005 it was agreed to drop the X prefix as of Zope 3.1 even though zope 2 migration isn't supported yet.
Zope X3 was the first release of Zope 3. The X signified that it was not backwards compatible with Zope 2. In 2005 it was agreed to drop the X prefix as of Zope 3.1 even though zope 2 migration isn't supported yet.