Help With File Extension PST

File Extension PST

The .pst file extension is known to be used by nine different software applications. The most common use of the extension is with the Microsoft Outlook and Exchange programs. In both applications the .past file is a container for email folders, archives messages, contact information, address books, etc. The files can be used interchangeably between the two applications, and in cases where a business uses Exchange server or client and supplies Outlook for its employees, the files are used seamlessly throughout the system. Microsoft Outlook Express does not use .past files natively but can import them. Importing is usually less than perfect; manual data manipulation will be needed to display data correctly in Outlook Express.


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While Microsoft .pst files are relatively stable and error free, their biggest draw back is their limited size. The files are limited to 2 GB and often cause problems as they approach the full size. If the file is reaching its limit, users should notice problems running Outlook or Exchange, but should notice the issues don't occur when these programs are not running. Symptoms of a full .pst file include overall system slowdown, system freezes, or crashing of Outlook or Exchange. Microsoft provides the Exchange 2000 Tool to allow users to reduce the size of these files, but reduction comes with a price. The program only allows a certain amount of data in each individual field, lopping off any data that exceeds the allotted space. Reduced .pst files will likely be missing data, primarily with longer names and addresses. Microsoft .pst files are proprietary and cannot be utilized by other software.

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More Info Regarding File Extension PST

LightWave 3D, a 3D animation and modeling tool from NewTek, assigns the .pst extension to files used for lighting presets. These proprietary files store data used to render lighting and textures in a 3D model. LightWave can export and import these files with no problem, but they can't be used by other software. Errors are rare and generally confined to corrupt data. File association errors can occur if double clicking a LightWave .pst on a Windows based machine with Outlook or Exchange. Changing the file associations is not recommended.

MIDI Studio was a program for sampling and creating multi-track MIDI music. The .pst files this program used were mixer presets that included data for individual filters like reverb, flanger, chorus, EQ, daft, cutoff, etc. The files were not usable outside of the software and could not be opened or edited with other programs. The MIDI Studio software was discontinued when publisher Magix introduced its Music Maker software.

Ulead is a collection of applications recently acquired by Corel, and used for photo and image processing, video editing and production, DVD creation, and other multimedia projects. Ulead assigns the .pst extension to pattern files which are used to enhance various video images. Little is known about these files, how they are used, and errors they are prone to. Assume the file format is proprietary to the Ulead software.

Medbasin is a windows-based program developed by the National Technical University of Athens, used to produce the daily or monthly hydrograph of a river. Each created model requires parameters to be setup which control the various aspects of how the data is interpreted. These parameters are saved in a .pst file. The model's author can chose one of the standard .pst files included with the software or create his own. Parameter file created by other users can be stored and used in a new model as well. The file format is proprietary to the Medbasin software and cannot be used by other products.

The three remaining programs that use the .pst extension are BMail, Lahey Fortran, and Mastercam. No specific information is known about these applications or their file formats. BMail is no longer developed or supported; Fortran is still used as a programming language albeit very rarely; Mastercam is a CNC application for industrial use still developed and supported by CNC Software, Inc.