Handling attachment content on a mobile device

A method of retrieving data of an attachment document of a message, wherein acts of the method are executable by a processor of a mobile device, the method comprising:

• displaying, at the mobile device, an attachment content handling option for the attachment document, wherein the message has been received at the mobile device but the attachment document has not been received at the mobile device, wherein the attachment content handling option comprises both a native application attachment content handling option and a client-server attachment content handling option;
• generating an attachment content handling request comprising an indication of the attachment document and a selected attachment content handling option;
• sending the attachment content handling request to a remote attachment service;
• if the selected attachment content handling option is the native application attachment content handling option, then receiving data of the attachment document, from the remote attachment service, in a format viewable using a native application on the mobile device;
• and
• if the selected attachment content handling option is the client-server attachment content handling option, then receiving data of the attachment document, from the remote attachment service, in a format optimized for at least one of transmission to and viewing on the mobile device.