over the years, Gladwev.com have come up with almost every solution to mail migration issues and the minutest of the complexities associated during the processes.
the list of clients they have managed to put up over these years successfully speaks the rest of the story. Their UI has been too user friendly too. the user doesn't have to be expert technically to use this tool.
they are among the handful of brands that have come up with tools that work equally well on both windows and MAC. Their tools sync equally well across the platforms. the obstructions at mail conversion due to OS incompatibility is reduced to almost nil, credits to the highly experienced panel behind these tools.
The support team is much responsive as well. As they claim, they are 24x7 available for help, even with remote desktop the entire year.
for more you may google out Gladwev.com. I am pretty sure you will receive the same brilliant experience the way their clients had been experiencing over the years. unlike many tools, Gladwev offer free trial before paying.
wish you luck.