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Opened Nov 07, 2025 by Donnie Hoehne@donniehoehne2
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Outlook performance issues in a Cached Exchange Mode ost or .pst file Outlook Microsoft Learn

The usual fixes like resetting credentials, reinstalling Office, and clearing cached profiles had no effect. Our goal is to give you the answers to fix the most common issues Outlook users face. Bookmark this page so that whenever you come across an error like your Outlook calendar not syncing, step-by-step Outlook troubleshooting or a corrupted file, you'll have a place to start troubleshooting. In case your Outlook PST is corrupt or damaged, you can always look for third-party Outlook PST Repair Tool to fix the issue. Inbox Repair Tool or ScanPST.exe is a free utility provided by Microsoft.

The error message states that there are some issues with Outlook PST files. This error tends to pop-out when you attempt to launch Outlook. The main reason, however, is the corruption in the PST file. Outlook simply denies the existence of PST file because the file is corrupt and step-by-step Outlook troubleshooting cannot be accessed anymore.

Microsoft Outlook is an essential tool for facilitating and improving collaboration both between employees and with third parties. As a result it is imperative that Outlook is installed, and kept up-to-date, on all required devices. Devices without an up-to-date Outlook client may result in an impaired digital experience and should be investigated. Devices with Outlook not installed should also be investigated to ensure that this is not an oversight. The "Outlook - Stability and compliance" live dashboard acts as the starting point of this library pack. It provides visibility into your Outlook landscape to easily monitor and uncover any issues and/or areas of improvement.

If you want to fix PST files using this tool, make sure to have a proper backup of the Outlook PST before processing. Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms. However, in some cases, the Inbox Repair tool (SCANPST) fails to repair the PST file. Opt for a better alternative tool such as a professional PST Repair Tool. Microsoft Outlook, like any other software on Windows, encounters several errors.

The first step is to check whether the PST file exists in its original location. You can also download the trial tool to try and test the working of the tool before buying the premium edition. If your PST file is stored on a network drive, ensure that the drive is accessible and that you have the necessary permissions. Reconnect to the network or contact your system administrator for assistance.

To avoid any issues, employees may be advised to switch step-by-step Outlook troubleshooting back to the classic version of Outlook. The dashboard's performance tab identifies potential performance issues and correlates with common root causes. This information can be used to inform support teams to assist in making appropriate decisions, such as changes to the application or upgrading the affected devices. In some cases, the ScanPST.exe freezes or fails to repair a corrupt PST file. This happens when the PST file you are trying to repair is large, severely corrupt, or encrypted.

If the problem doesn't occur after you restart Outlook, one of the add-ins is likely the cause of the problem. Restore the add-ins one at a time until the problem does occur to determine which add-in is causing the problem. Make sure that the latest updates for Outlook are installed. For more information, see How to install the latest applicable updates step-by-step Outlook troubleshooting for Microsoft Outlook (US English only). Many of these items can be automatically checked by the Classic Outlook Advanced Diagnostics troubleshooter.

Also, we go over the stepwise working procedure of both solutions and the reasons behind PST file corruption issues. The Inbox Repair tool or ScanPST.exe is not a convenient way because of multiple restrictions. Moreover, this tool can quickly recover email messages, calendars, tasks and other data from corrupted PST files.

If I run an online repair and reboot her PC it will usually work for a day or two. Kinda at a loss at this point, I am thinking about wiping the PC and starting again. When you start Windows normally, several applications and services start automatically and then run in the background.

Avoid frustration and wasted time with a slow Outlook on Windows 10. This post provides practical solutions to speed up your email program. Using products such as Windows Desktop Search and Google Desktop Search is a great way to be able to quickly find email messages. However, if you are not careful, step-by-step Outlook troubleshooting these products my negatively affect Outlook’s and your computer’s performance. Be sure to configure them to only index the email messages and files which you need to be able to find quickly.

To reduce the number of items that are stored locally, limit the synchronization window that's used for shared folders. These keys don't clean up older Calendar content that was already downloaded. However, this method can be effective if you're willing to clear offline items and resync your Calendar (instead of bulk deleting old items). If you already have the Calendar in the profile, you have to clear the Offline Items after you set the registry keys and restart Outlook. In Sync Window Settings, adjust the number of months of data that are synced for the primary shared calendars. Use the Turn on shared calendar improvements option for users who have edit permissions to a shared calendar to improve performance.

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Reference: donniehoehne2/rocco1986#12