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Summary

Requirements

Instructions

Changelog

Comments1402

Bugs16

The VMware OS Optimization Tool helps in preparing and optimizing Windows 10/8/7 and Windows Server 2019/2016/2012 systems for use with VMware Horizon.

At a high level, the process of creating a master VM image consists of the following steps.

The OS Optimization Tool helps with three key steps in this process:

Optimize
Generalize
Finalize

For a step by step walkthrough of the complete process, see the Creating an Optimized Windows Image for a VMware Horizon Virtual Desktop guide.

Additionally, the OS Optimization Tool helps running Windows Update on a master VM image that has previously been optimized and had functionality disabled.

The OS Optimization Tool includes customizable templates to enable or disable Windows system services and features, per VMware recommendations and best practices. Since most Windows system services are enabled by default, the optimization tool can be used to easily disable unnecessary services and features to improve performance and user experience.

The Analyze button, at the bottom, compares the settings of the template against the machine settings.

The Common Options button opens a dialog where the tabs allow you to quickly and easily choose and set preferences to control common functionality. These options normally involve configuring multiple individual settings in the template. By grouping the actions together, the individual settings get configured as necessary to give the desired outcome.

Amongst the settings in this dialog there is the option to remove Windows 10 Store Apps while keeping commonly used ones.

The Optimize button, at the bottom of the page, applies the template settings to the machine.

Generalize helps in running the system preparation tool (Sysprep) by generating a customizable and editable unattend answer file.

Finalize provides the option to automate and help with some of the common clean up tasks that are typically run just before using the prepared image. These include system clean up tasks and clearing information that makes the image cleaner and ready for use with Horizon.

Update

Update makes it easy to re-enable Windows Update functionality on an image that has previously been optimized and had this disabled.

The four steps should be run in order.

Enable – Changes the required registry values, local group policy and enables the required services.
Windows Update – Starts the Windows update process and open the Windows UI setting page. You can run the Windows Update process as often as required and reboot, if necessary, before progressing to the next step.
Restore – Returns all settings to their original values. This will also disable scheduled tasks that get regenerated when a Windows Update runs.
Recommendations – After updating Windows, it is recommended that you rerun an optimize using your original optimization settings and then a finalize task.

My Templates lists all the built-in templates, templates you have created or downloaded. It also allows you to examine the detail of a template, the individual settings and understand what action is carried out if that setting is selected.

Public Templates allows you to share your templates, get templates from the community, or update the built-in templates (if an update is available).

Windows 7/8/10, Windows Server 2008 R2/2012/2016/2019
NET Framework 3.5, SP1 or later

Download file from Download button and unzip the file.
Double-click the executable to run the tool on the machine you want to optimize. Follow instructions from there.

For more information, please see the VMware Operating System Optimization Tool Guide.VMware Operating System Optimization Tool Guide.

For details on the complete process for creating an optimized Windows image from beginning to end, please see the Creating an Optimized Windows Image for a VMware Horizon Virtual Desktop guide.

August, 2020, b1171 Version Update

Optimizations
Disable Passive Polling is no longer selected by default as this was shown to cause issues with some applications thinking they did not have internet connectivity. Note that this optimization entry was previously incorrectly named as Enable Passive Polling.
Added new setting to Use WDDM graphics display driver for Remote Desktop Connections.
UI Improvements
Brand new interface functionality to allow searching of the optimizations to find specific entries. This is available on both the Optimize and My Templates tabs and allows you to find and view settings based on what you type in.
Added a grid splitter to extend area of left tree view under My Templates.
Common Options
New controls to simplify keeping Cortana search and how the search box appears in the taskbar.
Generalize
New option to specify the Administrator account to use after running SysPrep. This defaults to the current user account. The account specified is also added to the Administrators and Remote Desktop Users groups.
New option to perform an automatic restart after the Generalize task has completed.
Bug Fixes

Common Options settings were reset after an optimization. These should now be retained.
Changed the way the default profile was used to ensure that this works when OSOT is run using the system account.
Windows Syspart Repair was being prevented from being disabled properly.
Windows Superfetch was being prevented from being disabled properly.
Windows Update was sometimes not disabled properly after running a generalize.
Updated templates were saved to the wrong location.

August, 2020, b1170 Update

Templates

New combined template for all versions of Windows 10 and Windows Server 2016 and 2019. Optimizations can have optional parameters to filter the version that a setting is applied to.

Optimizations

Turn off NCSI is no longer selected by default as this was shown to cause issues with some applications thinking they did not have internet connectivity.

New Optimizations added and some removed, For details see: https://techzone.vmware.com/resource/vmware-operating-system-optimization-tool-guide#Template_Updates

Bug Fixes

Fixed issues with re-enabling Windows Update functionality on Server 2016 and 2019.

Fixed issue that was preventing Windows Antimalware from being disabled properly.

Common Options

Changed interface and language on the Common Options page for Windows Update to remove confusion. This option can only be used to disable Windows Update as part of an optimization task. To re-enable Windows Update functionality, use the Update button on the main menu ribbon.

Guides

Updated OSOT user guide: VMware Operating System Optimization Tool Guide.

June, 2020, b1160

Windows Update
Brand new option called Update that make it easier to re-enable Windows Update functionality on a Windows image that has previously been optimized and had this disabled.

This process has the following four steps:

Enable – Changes the required registry values, local group policy and enables the required services.
Windows Update – Starts the Windows update process and open the Windows setting page. You can run the Windows Update process as often as required and reboot, if necessary, before progressing to the next step.
Restore – Returns all settings to their original values. This will also disable scheduled tasks that get regenerated when a Windows Update runs.
Recommendations – After updating Windows, it is recommended that you rerun an optimize and then a finalize task.

Generalize

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