There's no import function in Entourage? I know Outlook (2000) can export .csv, .dbs, .xls, .mdb, FoxPro, and .tab formats. You can also change the field 'mapping' during the output. Not as useful as your new program simply reading the .pst file (where everything in outlook is stored), but perhaps useful. As for Outlook as an Exchange client, I have no idea, but Outlook as a standalone is not bad at exporting.

-Zeke