Abstract: Variety of approaches to provide partial storage of large files in distinct storage systems are described. A storage service initiates operations to provide storage of large files by determining a rapid access portion and a slow access portion of a file. The rapid access portion of the file is stored in a rapid access storage system and the slow access portion of the file (or an entirety of the file) is stored in a slow access storage system. In response to an access request to the file, the rapid access portion of the file is provided from the rapid access storage system. Next, the slow access portion of the file is retrieved from the slow access storage system to be provided while providing the rapid access portion of the file.

Abstract: Variety of approaches to provide partial storage of large files in distinct storage systems are described. A storage service initiates operations to provide storage of large files by determining a rapid access portion and a slow access portion of a file. The rapid access portion of the file is stored in a rapid access storage system and the slow access portion of the file (or an entirety of the file) is stored in a slow access storage system. In response to an access request to the file, the rapid access portion of the file is provided from the rapid access storage system. Next, the slow access portion of the file is retrieved from the slow access storage system to be provided while providing the rapid access portion of the file.

Abstract: Functionality is described for sending updated engine logic to a user device. The engine logic is expressed in a description language, such as the extensible markup language (XML). The user device uses the updated engine logic to update a parse tree. The user device then uses the parse tree to process various events. By virtue of the formation of the engine logic in a description language, a network-accessible service can disseminate the engine in an efficient manner. In one illustrative application, the user device can use the parse tree to process electronic messages (e.g., Email messages) that have been received by the user device.

Abstract: Functionality is described for sending updated engine logic to a user device. The engine logic is expressed in a description language, such as the extensible markup language (XML). The user device uses the updated engine logic to update a parse tree. The user device then uses the parse tree to process various events. By virtue of the formation of the engine logic in a description language, a network-accessible service can disseminate the engine in an efficient manner. In one illustrative application, the user device can use the parse tree to process electronic messages (e.g., Email messages) that have been received by the user device.

Abstract: Functionality is described for sending updated engine logic to a user device. The engine logic is expressed in a description language, such as the extensible markup language (XML). The user device uses the updated engine logic to update a parse tree. The user device then uses the parse tree to process various events. By virtue of the formation of the engine logic in a description language, a network-accessible service can disseminate the engine in an efficient manner. In one illustrative application, the user device can use the parse tree to process electronic messages (e.g., Email messages) that have been received by the user device.

Abstract: Functionality is described for sending updated engine logic to a user device. The engine logic is expressed in a description language, such as the extensible markup language (XML). The user device uses the updated engine logic to update a parse tree. The user device then uses the parse tree to process various events. By virtue of the formation of the engine logic in a description language, a network-accessible service can disseminate the engine in an efficient manner. In one illustrative application, the user device can use the parse tree to process electronic messages (e.g.