1. A communication system ( 30 ) comprising: a mobile wireless communications device ( 35 a - 35 c ) associated with an account including an ordered master set ( 80 ) of personal information manager (PIM) entries ( 81 a - 81 c ) for a type of PIM data; the mobile wireless communications device configured to store an ordered subset ( 85 ) corresponding to the ordered master set of PIM entries for the type of PIM data; and a synchronization server ( 32 ) configured to synchronize the mobile wireless communications device and the account by mapping at least one PIM entry ( 81 d ) from the ordered master set to fill the ordered subset responsive to deletion of a PIM entry ( 86 c ) from the ordered subset.