Many experts say that this is not recommended, and that we should migrate on a short period, and not coexist for so much time. In spite of expert advice, our IT manager absolutely wants a coexistence plan. Up until now, we have had many problems with this kind of migration.
What is your opinion about this approach to migration?
You will most likely need a solution for: a unified global address list, distribution list synchronization, public folder data/permission/forms/views synchronization, etc. In addition, you need to factor in the overhead of additional support for two production systems.
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