In Hosted Messaging and Collaboration version 4.0, users in the Admins and CSRAdmins groups could send or receive e-mails as anyone else under their organizations. Hosted Messaging and Collaboration version 4.5 explicitly denies the Send-As and Receive-As permissions for both the Admins and CSRAdmins groups for newly provisioned organizations.

To update the permission restrictions for existing organizations after the upgrade from Hosted Messaging and Collaboration version 4.0 to version 4.5, you must install the quick fix engineering (QFE) hotfix for e-mail permission migration. To obtain the QFE hotfix, please contact Microsoft Product Support Services.