Hello,
My name is Jobin Johny and am one of the top rated IT Freelancer in Freelancer and Upwork ( You can refer my profile) .Though am not located near south Africa, Surely i can definitely manage the project as it is for Active Directory and Exchange which requires only minimum onsite requirements. Trust me we can do all AD and exchange management Remotely. This will save your money and time to manage the environment.
Thanks,
Jobin