{"id":18596,"date":"2022-02-24T06:18:31","date_gmt":"2022-02-24T06:18:31","guid":{"rendered":"https:\/\/www.backupassist.com\/blog\/?p=18596"},"modified":"2022-02-24T06:29:32","modified_gmt":"2022-02-24T06:29:32","slug":"tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file","status":"publish","type":"post","link":"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file","title":{"rendered":"Tech Tip: How to rebuild or repair a corrupt PST file"},"content":{"rendered":"\n<p>If a PST file is corrupt, you still have an excellent chance of salvaging almost all your data. That\u2019s possible with the PSTRebuild tool, which extracts as much data out of your corrupted PST file and creates a fresh new PST file that you can use.&nbsp;<\/p>\n\n\n\n<p>Let\u2019s look at the various aspects of PST file recovery, and how you can effectively \u201cfix\u201d a damaged PST file.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">TL;DR summary&nbsp;<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>1 minute introduction \u2013 what PST files are&nbsp;<\/li><li>Signs that a PST file is corrupt, and how it happens&nbsp;<\/li><li>How to rebuild (repair) a PST using the PSTRebuild tool&nbsp;<\/li><li>How long will a rebuild take?&nbsp;<\/li><li>Are PST files bad and unreliable? Should I stop using them?&nbsp;<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">What are PST files? How are they used?&nbsp;<\/h2>\n\n\n\n<p>The PST file, officially the \u201cOutlook Data File\u201d, is the file format used by Microsoft Outlook to store mailbox items. It supports multiple types of items \u2013 from emails, to calendar entries, contacts, and more.&nbsp;&nbsp;<\/p>\n\n\n\n<p>PST stands for \u201cPersonal Storage Table\u201d. Invented by Microsoft, and documented in their <a href=\"https:\/\/docs.microsoft.com\/en-us\/openspecs\/office_file_formats\/ms-pst\/141923d5-15ab-4ef1-a524-6dce75aae546\" target=\"_blank\" rel=\"noreferrer noopener\">open specifications documentation<\/a>, it has been in usage for over 20 years as the storage format used by Outlook to store local copies of mailbox items.&nbsp;<\/p>\n\n\n\n<p>The near-ubiquitous nature of PST files, their longevity and ability to store all forms of items supported by Microsoft Exchange, also makes the PST file format a popular choice for backup and archiving. For example, <a href=\"https:\/\/www.backupassist.com\/365\/overview\" target=\"_blank\" rel=\"noreferrer noopener\">BackupAssist 365<\/a> uses the PST file format for backing up Office 365 mailboxes, while <a href=\"https:\/\/support.microsoft.com\/en-us\/office\/autoarchive-settings-explained-444bd6aa-06d0-4d8f-9d84-903163439114\" target=\"_blank\" rel=\"noreferrer noopener\">Microsoft Outlook\u2019s Autoarchive feature<\/a> also uses the PST file format for storing items older than a given age (such as 6 months).&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signs that a PST file is corrupt, and how does the corruption happen?&nbsp;<\/h2>\n\n\n\n<p>The clearest sign a PST file is corrupt is that it will not open in Microsoft Outlook. We\u2019ve seen 3 different behaviours.&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>If you\u2019re lucky, Outlook detects the corruption and offers to fix it for you.&nbsp;<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-11.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-11.png\" alt=\"\" class=\"wp-image-18598\" width=\"488\" height=\"258\" srcset=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-11.png 975w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-11-300x159.png 300w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-11-768x406.png 768w\" sizes=\"auto, (max-width: 488px) 100vw, 488px\" \/><\/a><\/figure><\/div>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\"><li>Sometimes a message like this will appear:&nbsp;<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-10.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-10.png\" alt=\"\" class=\"wp-image-18597\" width=\"378\" height=\"158\" srcset=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-10.png 756w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/image-10-300x125.png 300w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/a><\/figure><\/div>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\"><li>Other times, Outlook simply crashes.&nbsp;<\/li><\/ol>\n\n\n\n<p>The corruption normally happens when a PST file is being written to, but is not closed properly. For instance, if many new items are being added to the PST file, and the computer experiences a hard crash during this write, the PST file is left in an invalid state. Because the computer crashed, the PST file\u2019s data structures were never written to the end of the PST file&#8230; leading to problems when trying to read the file again.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to rebuild (repair) a PST file using the PSTRebuild tool&nbsp;<\/h2>\n\n\n\n<p>If a PST file is corrupt, chances are that it can be recovered or salvaged. That\u2019s because it\u2019s likely that only a small fraction of the file (like the internal data structures) is corrupted, meaning your actual data is still intact.&nbsp;<\/p>\n\n\n\n<p>The PSTRebuild tool, that comes bundled with BackupAssist 365, is a great tool that will copy out all valid items from your corrupted PST file into a brand new PST file.&nbsp;<\/p>\n\n\n\n<p>And if you are concerned about data integrity \u2013 it does not perform any write operations to your corrupted file, so it won\u2019t do any further damage to the original.&nbsp;<\/p>\n\n\n\n<p>Here\u2019s how to get and use the tool.&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Download a <a rel=\"noreferrer noopener\" href=\"https:\/\/www.backupassist.com\/365\/downloads\" target=\"_blank\">free 30-day trial of BackupAssist 365<\/a>. The PST Repair tool comes bundled with this software. After the repair is complete, you can choose to use or uninstall the software.&nbsp;<\/li><li>Run the PST Repair tool via command line. It is available at this path:&nbsp;<br>&nbsp;<br>C:\\Program Files (x86)\\Cortex I.T. Labs Pty Ltd\\BackupAssist 365\\maillibnet\\PSTRebuild.exe&nbsp;<br>&nbsp;<br>And the syntax is really simple:&nbsp;&nbsp;<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax-1024x336.png\" alt=\"\" class=\"wp-image-18606\" width=\"512\" height=\"168\" srcset=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax-1024x336.png 1024w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax-300x99.png 300w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax-768x252.png 768w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/PST-rebuild-syntax.png 1303w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/figure><\/div>\n\n\n\n<p>Here&#8217;s an example of using the PSTRebuild tool to rebuild the file \u201cdamaged.pst\u201d into \u201crebuilt.pst\u201d.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Command-line-running-to-rebuild-PST-file.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Command-line-running-to-rebuild-PST-file.jpg\" alt=\"\" class=\"wp-image-18604\" width=\"750\" height=\"395\" srcset=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Command-line-running-to-rebuild-PST-file.jpg 1000w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Command-line-running-to-rebuild-PST-file-300x158.jpg 300w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Command-line-running-to-rebuild-PST-file-768x405.jpg 768w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/figure><\/div>\n\n\n\n<p>If you navigate to the directory where the PST files are, you\u2019ll see that the rebuilt PST file may be slightly smaller than the original.&nbsp;<\/p>\n\n\n\n<p>As a by-product of doing the rebuild, your PST file will also be compacted at the same time.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Resulting-PST-files-1024x303.png\" alt=\"\" class=\"wp-image-18607\" width=\"512\" height=\"152\" srcset=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Resulting-PST-files-1024x303.png 1024w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Resulting-PST-files-300x89.png 300w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Resulting-PST-files-768x227.png 768w, https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/Resulting-PST-files.png 1064w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/figure><\/div>\n\n\n\n<p><strong>Congratulations!<\/strong>&nbsp;<\/p>\n\n\n\n<p>You can now use your rebuilt PST file and get on with life!&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\">\n  <table style=\"border-collapse:collapse;border:none;width:100%;background:#d1dff1;border-radius:5px;\">\n    <tbody>\n      <tr>\n        <td style=\"width:9%;pading:30px;border-collapse:collapse;border:none;color:#282561;text-align:left;vertical-align:top;\"><br\/>\n          <img decoding=\"async\" src=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/tips.svg\">\n        <\/td>\n        <td style=\"width:91%;pading:30px;border-collapse:collapse;border:none;color:#282561;text-align:left;\"><br\/>\n          <b>Helpful tip:<\/b>\n          you can avoid future emergencies and data loss by performing regular backups. If you host your mailboxes in Office 365 or Exchange Server, then BackupAssist 365 is a great solution for small and medium businesses. It gives you local backups of your cloud data by downloading your data on schedule. Try it for free by simply continuing your 30-day trial!\n          <br\/><br\/>\n          <a href =\"https:\/\/www.backupassist.com\/365\/downloads\" style=\"border-radius:5px;padding:10px 20px 10px 20px;color:white;background:#57b94b;\">Download and claim your free 30-day trial<\/a>\n          <br\/><br\/>\n        <\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How long will a PST rebuild take?&nbsp;<\/h2>\n\n\n\n<p>A PST rebuild will take longer for bigger files. The process involves reading, processing and writing a lot of data, so the time taken is highly dependent on the size and contents of your PST file, the speed of your storage, and to a lesser degree, the speed of your processor.&nbsp;<\/p>\n\n\n\n<p>When repairing our own files, our results are:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>14 minutes to rebuild a 3.7 GB file, using SSD storage&nbsp;<\/li><li>4 hours 25 minutes to rebuild a 26.6 GB file, using SSD storage&nbsp;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Are PST files bad? Should I stop using them?&nbsp;<\/h2>\n\n\n\n<p>This question is often asked by people who\u2019ve experienced a PST corruption. Our view is quite simple.&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Yes, PST files can get corrupted.\u00a0<\/li><li>For that matter, any file can get corrupted \u2013 such as ZIP files.\u00a0<\/li><li>There\u2019s no other feasible file format to store Microsoft Exchange items. (See below)\u00a0<\/li><li>They\u2019re also really practical \u2013 offering portability and long term retrievability.\u00a0<\/li><\/ol>\n\n\n\n<p>From my personal perspective, as someone who\u2019s been in the industry for 20+ years, PSTs are still the best choice to store mailbox items.&nbsp;&nbsp;<\/p>\n\n\n\n<p>If you want to store mailbox items offline, then the choices are really limited. Alternatives such as Maildir and MBOX don\u2019t necessarily support Microsoft Exchange specific items and aren\u2019t any easier to deal with.&nbsp;<\/p>\n\n\n\n<p>The only other option would be a database, which is not exactly portable or lightweight! And because PST files have been around for decades, using this file format is a good choice because it\u2019s highly likely there\u2019ll be software available to read PST files for decades to come.&nbsp;<\/p>\n\n\n\n<p>So for better or for worse, I think PSTs are here to stay.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PST files are a de-facto standard to store mailbox items such as emails, contacts, calendar items, and notes. They can get damaged and refuse to open in Microsoft Outlook if there\u2019s a hardware failure or computer crash. Let\u2019s explore how to recover your data from a broken PST file.<\/p>\n","protected":false},"author":17,"featured_media":18632,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[763,95],"tags":[],"class_list":["post-18596","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backupassist-365","category-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Tech Tip: How to rebuild or repair a corrupt PST file - Cyber Resilience Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tech Tip: How to rebuild or repair a corrupt PST file - Cyber Resilience Blog\" \/>\n<meta property=\"og:description\" content=\"PST files are a de-facto standard to store mailbox items such as emails, contacts, calendar items, and notes. They can get damaged and refuse to open in Microsoft Outlook if there\u2019s a hardware failure or computer crash. Let\u2019s explore how to recover your data from a broken PST file.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\" \/>\n<meta property=\"og:site_name\" content=\"Cyber Resilience Blog\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-24T06:18:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-02-24T06:29:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/rev-731-hero.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"468\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Linus Chang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Linus Chang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\"},\"author\":{\"name\":\"Linus Chang\",\"@id\":\"https:\/\/www.backupassist.com\/blog\/#\/schema\/person\/e3b9b8dd4c91aac329df23310ea033be\"},\"headline\":\"Tech Tip: How to rebuild or repair a corrupt PST file\",\"datePublished\":\"2022-02-24T06:18:31+00:00\",\"dateModified\":\"2022-02-24T06:29:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\"},\"wordCount\":1071,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.backupassist.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.backupassist.com\/app\/uploads\/sites\/3\/2022\/02\/rev-731-hero.jpg\",\"articleSection\":[\"BackupAssist 365\",\"Guides\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\",\"url\":\"https:\/\/www.backupassist.com\/blog\/tech-tip-how-to-rebuild-or-repair-a-corrupt-pst-file\",\"name\":\"Tech Tip: How to rebuild or repair a corrupt PST file - 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They can get damaged and refuse to open in Microsoft Outlook if there\u2019s a hardware failure or computer crash. 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