Configure the Autodiscovery Service as described here: http://technet.microsoft.com/en-us/library/bb201695.aspx or configure a single Client Access Server for all mailboxes in Allocatus Server configuration. Make sure you have configured the Allocatus Service Account as User Principal Name (UPN), e.g. user@domain.com, which is mandatory for Office 365. Domain\SamAccountName. For details see section Configure Exchange Online Connection in Allocatus Admin Guide: http://community.allocatus.com/files/folders/allocatus/entry15.aspx.
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