11. A computer program product comprising a computer readable storage medium having program code stored thereon, the program code executable by a processor to perform a method comprising: for each of a plurality of e-mail files contained in a first data repository, determining, by the processor, at least one score for the e-mail file, determining the at least one score comprising: determining whether the e-mail file contains at least one design element; and responsive to determining that the e-mail file contains at least one design element, determining whether the design element is authored by a template developer; and determining whether the design element is a custom design element created specifically for a particular user; based on scores assigned to the plurality of e-mail files, automatically assigning, by the processor, a ranking to each of the plurality of e-mail files, the ranking assigned to each e-mail file indicating a priority of the e-mail file as a candidate for migration to a second data repository; based on the ranking assigned to each of the plurality of e-mail files, automatically identifying, by the processor, e-mail files having a ranking that at least meets a threshold value; responsive to automatically identifying e-mail files having the ranking that at least meets the threshold value, presenting to a user a selectable user interface element; and responsive to the user selecting the user interface element, automatically initiating, by the processor, migration of the e-mail files having the ranking that at least meets the threshold value to the second data repository.
11. A computer program product comprising a computer readable storage medium having program code stored thereon, the program code executable by a processor to perform a method comprising: for each of a plurality of e-mail files contained in a first data repository, determining, by the processor, at least one score for the e-mail file, determining the at least one score comprising: determining whether the e-mail file contains at least one design element; and responsive to determining that the e-mail file contains at least one design element, determining whether the design element is authored by a template developer; and determining whether the design element is a custom design element created specifically for a particular user; based on scores assigned to the plurality of e-mail files, automatically assigning, by the processor, a ranking to each of the plurality of e-mail files, the ranking assigned to each e-mail file indicating a priority of the e-mail file as a candidate for migration to a second data repository; based on the ranking assigned to each of the plurality of e-mail files, automatically identifying, by the processor, e-mail files having a ranking that at least meets a threshold value; responsive to automatically identifying e-mail files having the ranking that at least meets the threshold value, presenting to a user a selectable user interface element; and responsive to the user selecting the user interface element, automatically initiating, by the processor, migration of the e-mail files having the ranking that at least meets the threshold value to the second data repository. 15. The computer program product of claim 11 , wherein determining the at least one score further comprises determining whether the e-mail file contains a number of personal folders or a number of e-mail rules exceeding a threshold value and determining the score for the e-mail file based, at least in part, on whether the e-mail file contains the number of personal folders or the number of e-mail rules exceeding the threshold value.