16. A computer-readable memory device with instructions stored thereon to transition a command user interface (UI) between a toolbar UI and a full menu UI based on a use context, the instructions comprising: detecting a request to interact with a message, wherein the request includes one of a first intent to read to message and a second intent to author the message; analyzing attributes associated with a usage of the message, wherein the attributes include at least a historical use pattern associated with the usage of the message; automatically identifying the use context based on the analysis of the attributes associated with the usage of the message; automatically identifying one of a reading mode and an authoring mode as a presentation mode based on the use context; automatically selecting one of the toolbar UI and the full menu UI as the command UI based on the identified presentation mode, wherein the toolbar UI includes reading mode commands and the full menu UI includes authoring mode commands; and displaying the selected command UI in the identified presentation mode.
16. A computer-readable memory device with instructions stored thereon to transition a command user interface (UI) between a toolbar UI and a full menu UI based on a use context, the instructions comprising: detecting a request to interact with a message, wherein the request includes one of a first intent to read to message and a second intent to author the message; analyzing attributes associated with a usage of the message, wherein the attributes include at least a historical use pattern associated with the usage of the message; automatically identifying the use context based on the analysis of the attributes associated with the usage of the message; automatically identifying one of a reading mode and an authoring mode as a presentation mode based on the use context; automatically selecting one of the toolbar UI and the full menu UI as the command UI based on the identified presentation mode, wherein the toolbar UI includes reading mode commands and the full menu UI includes authoring mode commands; and displaying the selected command UI in the identified presentation mode. 18. The computer-readable memory device of claim 16 , wherein the instructions further comprise: detecting an application platform of a messaging UI as a desktop application; automatically identifying the authoring mode as the presentation mode; automatically placing the authoring mode commands on the full menu UI to present the full menu UI as the command UI; automatically partitioning the authoring mode commands to a plurality of command group menus; and displaying one of the plurality of command group menus based on the use context.