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Open PST File

PST or Personal Storage Table file is used to store local copies of e-mails, tasks, calendar events, and other items from Microsoft Outlook or Microsoft Exchange Client. Alternative names for PST files are Personal Folders file or Post Office file. Similar to PST, OST file extension is used to store offline copies of e-mails, tasks and calendar events.

User e-mails are stored on Microsoft Exchange server and when user connects to it with a client like Microsoft Outlook e-mails are downloaded to a computer so user can view them. Depending on settings in Microsoft Outlook only e-mails which are currently viewed are downloaded or entire folders could be downloaded locally to a computer. When many e-mails or other items in folder needs to be stored locally then PST file is used.

PST and OST files are useful when you want to backup history of your e-mails for future usage. You can move e-mails from your main folder to a backup one and archive backup folder to a PST file. After that you can copy PST file to a backup drive and only access it when necessary.

PST files are also used by Microsoft Outlook for Import/Export purposes. If you want to export a number of e-mails to a storage device Microsoft Outlook will offer PST as a storage format option.

To export to PST, you need to select File->Open & Export->Import/Export. After that select “Export to a file” and then select “Outlook Data File (.pst)” from a list. Choose folders which you want to export, location for the PST file and select OK to proceed with export.

To open PST file select File->Open & Export->Import/Export. After that select “Import from a file” and then select PST file that you want to import. Click OK to proceed.

PST and OST files can get quite large which may decrease performance of Microsoft Outlook while working with them. It may make sense to store several large folders in separate PST files to improve importing and exporting performance of Microsoft Outlook.

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RPMSG Quick Info
  Rights-Managed Email Object Protocol File
Opens with
  Microsoft Outlook
  Microsoft Outlook Web App (OWA)
  Azure Information Protection viewer