Unfortunately at this stage ServiceM8 only integrates with the MYOB AccountRight range and MYOB Essentials of software for Windows based PC's.
MYOB AccountEdge does not currently provide the 3rd party product integration that would be required to implement a real-time link between ServiceM8 and MYOB.
Alternatively, you can speak to a ServiceM8 Partner about switching from MYOB AccountEdge to MYOB AccountRight on your mac (using special software called Parallels which allows you to run windows software).
For more information about integrating ServiceM8 with MYOB AccountRight, click here.