The Corpus of Early English Correspondence (CEEC) was compiled with historical sociolinguistics in mind. The original concept was to test how methods created by sociolinguists studying present-day languages could be applied to historical data. As the corpus yielded promising results, the research team has found many important links between language change and social variables. Some of these findings are reported in Nevalainen & Raumolin-Brunberg (2003), Laitinen (2007), Nevala (2004), Nurmi (1999), and Palander-Collin (1999). The application of sociolinguistic methods is made possible by an extensive database containing background information about letter writers. This database is currently being extended to cover information on letter recipients as well. A second database contains information on each letter, including data on eg authenticity in addition to sender and recipient. An interface, allowing combined searches from these databases and making the selection of desired social groups for study has been developed and is currently being tested.