1. A computer implemented method for managing attempts made by computing devices to access centralized enterprise level data according to at least one device classification level rule, the method comprising the steps of: defining a plurality of classes of computing devices, by a computer; assigning definitions of each specific one of a plurality of computing devices to a specific one of the plurality of defined classes, based on attributes concerning the specific computing device, by the computer; receiving a request from an unclassified computing device to access centralized enterprise level data, by the computer, wherein the received request contains information concerning the unclassified computing device; reading information concerning the unclassified computing device from the received request, by the computer; classifying the unclassified computing device into a specific one of the plurality of defined classes, by the computer, based at least partially on information concerning the computing device read from the received request; responsive to the classification of the computing device into the specific defined class, governing the received request to access centralized enterprise level data, by the computer, according to at least one device classification level rule, wherein the at least one device classification level rule specifies an access policy for computing devices of the specific defined class; and responsive to a definition of the unclassified computing device not having been assigned to a specific class, comparing information concerning the computing device read from the received request to corresponding information concerning multiple computing devices for which definitions have been assigned to defined classes, comprising: comparing at least some attributes from a plurality of attributes; assigning different weights to at least some of the plurality of attributes, wherein a weight assigned to an attribute reflects a level of importance of the attribute in determining most similar known mobile devices for the purpose of classifying unknown ones; and saving the classification of the computing device to classify subsequent instances of unknown computing devices having a same definition.