Archived:Registering third-party MTM as default mailbox only possible on Nokia Eseries devices (Known Issue)
Registering a 3rd party e-mail MTM as the default mailbox works on Nokia Eseries devices but not on Nokia Nseries devices in S60 3rd Edition.
Trying to set a 3rd party MTM as the default mailbox in Nokia Nseries devices has no effect. For example, when selecting a mailto: e-mail link in the Web Browser for S60, the following dialog is displayed: "No mailbox defined. Define now?".
No known workaround. Currently it is not possible to register a 3rd party MTM as the default mailbox in Nokia Nseries devices.