We have recently updated our email server to fully support Windows Mobile / PDAs / Smart Phones. If you have a DriveHQ account, you can easily set it up on your portable device and access your emails on the go.
As with other email clients, when setting up DriveHQ emails on portable devices, make sure to check that "Outgoing / sending emails require logon / authentication". The logon credentials is the same as receiving emails.
The service is free now; in the future, we might make it an add-on service to premium users only. Please report any problems to DriveHQ customer support.