More broadly, what percentage of mergers are successful? I'd guess less than 20% if compared to the analyses that make them attractive to companies.
I've been involved (at the worker bee level) in multiple mergers and in every case where they attempted to merge systems it easily took 5-10X the estimated time, cost and resources.
The most successful mergers were the ones where they either left the companies separate (minimizing the ability to reduce costs) or the ones where they just threw away one of the company's systems, got rid of most of their employees, most of their products, and just acquired their customers.
I've been involved (at the worker bee level) in multiple mergers and in every case where they attempted to merge systems it easily took 5-10X the estimated time, cost and resources.
The most successful mergers were the ones where they either left the companies separate (minimizing the ability to reduce costs) or the ones where they just threw away one of the company's systems, got rid of most of their employees, most of their products, and just acquired their customers.