Final answer:
Formalization is not one of the main strategies for merging different corporate cultures, as it regards organizational structure rather than cultural blending.
Step-by-step explanation:
The strategy that is not one of the main strategies for merging different corporate cultures is formalization. When corporations merge, they often have to blend distinct corporate cultures, which can be achieved through various methods such as assimilation, where one culture is absorbed into another, acculturation, which involves mutual adaptation between merging entities, integration, a combination that maintains aspects of both cultures, and separation, where distinct cultures coexist separately. Formalization refers to how structured and procedural an organization is, and is not typically considered a strategy for merging cultures.