A method of processing data in a network, the network comprising a first server and a second server (212, 214), the first server having access to a first data store storing first data according to a first predefined format, the method comprising: transmitting, from the first server to the second server, first information characterising the first predefined format according to which the first data is stored at the first data store; obtaining, at the second server, mapping information characterising a mapping of the first predefined format onto a second predefined format different to the first predefined format; generating, at the second server, based on the first information and the mapping information, second information for converting data in the first predefined format into data in the second predefined format; transmitting, from the second server to the first server, the second information; parsing, at the first server, using the second information, the first data stored at the first data store, to generate, at the first server, data in the second predefined format; the method being characterised in that it further comprises: obtaining, at the second server, segmentation information characterising one or more attribute values on the basis of which the data in the second predefined format is to be segmented; transmitting, from the second server to the first server, the segmentation information; and at the first server, segmenting the data in the second predefined format based on the segmentation information, thereby to produce a segmentation output, wherein the data are data on subscribers of a service provider, including subscriber attributes and corresponding attribute values, wherein a format is one or more of a set, syntax, and/or ordering of subscriber attributes and/or attribute values according to which the data are stored by the service provider, and wherein the data are used for targeting content at one or more specific subscriber segments in the segmentation output obtained using the one or more subscriber attribute values characterised in the segmentation information. transmitting, from the first server to the second server, first information characterising the first predefined format according to which the first data is stored at the first data store; obtaining, at the second server, mapping information characterising a mapping of the first predefined format onto a second predefined format different to the first predefined format; generating, at the second server, based on the first information and the mapping information, second information for converting data in the first predefined format into data in the second predefined format; transmitting, from the second server to the first server, the second information; parsing, at the first server, using the second information, the first data stored at the first data store, to generate, at the first server, data in the second predefined format; the method being characterised in that it further comprises: obtaining, at the second server, segmentation information characterising one or more attribute values on the basis of which the data in the second predefined format is to be segmented; transmitting, from the second server to the first server, the segmentation information; and at the first server, segmenting the data in the second predefined format based on the segmentation information, thereby to produce a segmentation output, wherein the data are data on subscribers of a service provider, including subscriber attributes and corresponding attribute values, wherein a format is one or more of a set, syntax, and/or ordering of subscriber attributes and/or attribute values according to which the data are stored by the service provider, and wherein the data are used for targeting content at one or more specific subscriber segments in the segmentation output obtained using the one or more subscriber attribute values characterised in the segmentation information.