posted by Thom Holwerda on Mon 26th Oct 2009 19:28 UTC, submitted by poundsmack
IconAnyone who has ever dealt with Microsoft Outlook will know the .pst file format - it's the binary, undocumented file in which all data from Outlook is stored - emails, contacts, calendar, you name it, it's in there. Microsoft has announced that it will release detailed technical documentation on the Outlook .pst data format.

The news was announced by Paul Lorimer, Group Manager at Microsoft Office Interoperability, on the Interoperability@Microsoft weblog. Microsoft says that data portability has become very important, especially now that all sorts of crucial information is stored in closed formats, and more specifically, in Outlook .pst files.

To meet the needs of customers and partners, Microsoft will release detailed technical documentation about the Outlook .pst format.

This will allow developers to read, create, and interoperate with the data in .pst files in server and client scenarios using the programming language and platform of their choice. The technical documentation will detail how the data is stored, along with guidance for accessing that data from other software applications. It also will highlight the structure of the .pst file, provide details like how to navigate the folder hierarchy, and explain how to access the individual data objects and properties.

This documentation is still in its early stages, and the company is gathering feedback from partners and interested customers about the documentation, to ensure that it will be "clear and useful". A wild guess is that it might arrive alongside the release of Office 2010, but I'm not basing that on anything other than common sense.

The documentation will be released under the Open Specification Promise, meaning that anyone can implement the .pst format in any away, on any platform, using any tool, free from any fears of patents. You do not need to contact Microsoft in any way.

A good move by Microsoft, but long overdue. Better late than never, I suppose, and it will also benefit open source Outlook equivalents like Evolution.

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