Convert.Guru

OST Converter

Convert OST files online for free


Drop or upload your .OST file

How to convert your OST file

  1. Click Select File above, and choose your OST file.
  2. You'll see a preview.
  3. Click the "Convert file to..." button to save your file in the format you want.


Convert OST to another file type

The converter easily converts your OST file to various formats—free and online. No Word or extra software needed.

  • OST to PST
  • OST to PDF
  • OST to TMP
  • OST to TEMP
  • OST to CACHE
  • OST to LOG
  • OST to BAK
  • OST to OLD
  • OST to NEW
  • OST to PART
  • OST to DOWNLOAD
  • OST to CRDOWNLOAD

Convert a file to OST

The converter also works in reverse, allowing you to convert your file into the OST file type—in the best quality.

  • DEVICE to OST
  • CACHE to OST
  • SOCK to OST
  • SYMLINK to OST
  • PID to OST
  • MOUNT to OST
  • FIFO to OST
  • LOG to OST
  • PIPE to OST
  • TMP to OST
  • JUNCTION to OST
  • TEMP to OST

About OST files

OST (Offline Storage Table) files are created by Microsoft Outlook and are used to store emails, contacts, notes, calendar items, and other Outlook data on a local computer. OST files are not compatible with other email programs and cannot be opened directly. To open an OST file, it must first be converted to a different file format, such as PST (Personal Storage Table) or MBOX (Mailbox).

Converting an OST file to another file format can be done using various software applications. It is important to note that some OST files may be corrupted or encrypted, which can make conversion difficult or impossible. Additionally, OST files can become large and difficult to manage, which can lead to performance issues and data loss.

For these reasons, it is recommended to use a free and easy online website, such as Convert.Guru, to convert OST files. Convert.Guru offers fast and secure conversion of OST files to PST, MBOX, EML, and other file formats, making it easy to open OST files in other email programs. Additionally, Convert.Guru offers a free trial, so you can test the service before committing to a paid plan.


The OST Converter Story

The history of Convert.Guru began more than 25 years ago in California, when Tom Simondi published the most comprehensive database of file formats on his website. Before that, Tom had worked on Space Shuttle development at the Air Force Systems Command’s Space Division in Los Angeles. He is known as one of the top programmers of the late 1980s.

When Microsoft integrated Tom’s Filext database into Windows XP, it became the leading platform for analyzing and processing file types and formats.

Today, we use the latest technologies to analyze, process, and convert one of the world's largest collections of file formats. We are committed to developing the best OST converter by continuously improving quality, usability, and reliability.

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