Bart Timmermans technical consultant at Inovativ has release am Exchange IP for Orchestrator.
Descriptions of the IP:
This integration pack is an addition on the already available Exchange Mail and Exchange calendaring integration packs. This IP will allow you to automate all (or at least most of them) Exchange (2010) related management tasks. For example:Adding and removing mailbox permissions
Tasks in the IP:
Download it here from the TechNet Gallery.