pre-reqs:
SSL certs on exchange servers
email domain “mycompany.com” added to office365 tenant and on-prem exchange’s accepted domains

error: “subtask checkprereqs execution failed” after running the wizard.
cause: on-prem exchange does not meet the min. update level for the office 365 tenant. in our case it was CU6.
source: http://support.microsoft.com/kb/2988229

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