A method and a system for managing and retrieving data within an electronic mail editor and/or an application external of the electronic mail editor are provided. In conventional systems, a user needs to sieve through their e-mail messages to locate messages of a same subject and thereafter to identify a most current or his required information. In the present invention, a reference data tag is inserted in an e-mail message and is linked to tag values stored in an appropriate database. The data tag may have one or more instances inserted in other messages at different times and assigned a different data tag value at the time of insertion. The data tag may be represented by similar indicia. To retrieve a most current value among the different values, a user merely accesses any of the indicia in any of the messages.