Good news for all those who do not want Outlook and change management programs email: Microsoft has release the specifications of the format PST. Specifically, a migration from Outlook to Thunderbird was possible until now, but through a reverse engineering of PDT and some current programs, like Mail (Mac OS X), Thunderbird (as Mac OS X or Linux) or Entourage (Outlook equivalent on Mac OS X, published by Microsoft ...) can not import data from Outlook.

Microsoft, by publishing full specifications of the format will therefore enable third-party programs to import data in a PST file but it is also possible for example to a program to retrieve data in the address book, etc. In fact, it's good news for interoperability, it only remains to wait for programmers using Microsoft's information, which may take some time.