Legacy Update is compatible with Windows 2000, XP, Vista, 7, 8, 8.1, 10, and 11, including equivalent Windows Server releases, in all editions (Professional, Home, Media Center Edition, etc.). It supports 32-bit (x86), 64-bit (x86-64), Itanium 64, and ARM64 installations of Windows.
An internet connection is required. Legacy Update setup may download and install additional components from Microsoft to ensure your system is compatible with our service.
Extra caveats to consider can be found in the following table:
| Operating System | Compatibility | |
|---|---|---|
|
Windows 2000 |
Supported on any edition of Windows 2000. Requires SP3 or SP4 and Internet Explorer 6. Legacy Update will install these for you automatically if needed. Windows Update does not support Windows 2000 Datacenter Server. More information |
|
Windows XP Windows Fundamentals for Legacy PCs Windows Server 2003/2003 R2 Windows Home Server 2007 Windows Embedded 2009 |
Supported on any edition and service pack of Windows XP, Server 2003, and Embedded 2009. You can optionally upgrade to SP3 via Legacy Update setup. Includes Itanium editions. Known issues: You may need to use a workaround to start Legacy Update setup, due to a bug in Windows XP/Server 2003. On Windows Server 2003/2003 R2 and XP Professional x64 Edition, checking for updates for the first time may take up to 30 minutes. Please be patient for this to complete. If you get the error message “External cab file processing completed with some errors”, simply try checking for updates again. |
|
Windows Vista Windows Server 2008 |
Supported on any edition of Windows Vista or Server 2008 with SP2 and a certain set of required updates. Legacy Update will install these for you automatically if needed. You can also optionally install Internet Explorer 9. Includes Itanium editions. Known issues: Checking for updates for the first time may take 30+ minutes. Please be patient for this to complete. Having Office 2010 installed may cause checking for updates to never complete. |
|
Windows 7 Windows Embedded 7 Windows Thin PC Windows Server 2008 R2 Windows Home Server 2011 |
Supported on any edition of Windows 7 or Server 2008 R2 with SP1 and a certain set of required updates. Legacy Update will install these for you automatically if needed. Known issues: Having Office 2010 installed may cause checking for updates to never complete. |
|
Windows 8 Windows 8.1 Windows Embedded 8/8.1 Windows Server 2012/2012 R2 |
Supported on any edition of Windows 8/8.1 and Server 2012/2012 R2 with a certain set of required updates. Legacy Update will install these for you automatically if needed. Upgrading from Windows 8 to Windows 8.1 is recommended. This requires some manual steps - Legacy Update can’t do this for you. |
|
Windows 10 Windows 11 Windows Server 2016, 2019, 2022, 2025 |
Supported on any edition of Windows 10/11, including Windows Server and Windows Insider preview builds. Legacy Update will only function as an alternative user interface to access the Windows Update service, and won’t otherwise make changes to your system. Accessible via Microsoft Edge in Internet Explorer mode, or you can use the Legacy Update shortcut on the Start menu to open in Internet Explorer. |
|
Windows 95, 98, Me Windows NT 3.x/4.x |
Try Windows Update Restored instead, another community project that aims to provide updates for earlier versions of the Windows Update service. Windows NT 3.x did not support Windows Update. Updates are installed manually on these versions of Windows. |
|
|
Windows 8 RT Windows 8.1 RT |
Legacy Update is currently not supported on Windows 8/8.1 RT (ARM-based) tablets, due to the unique security features of this version of Windows. Please note that this only applies to a small range of tablets - most Windows 8/8.1 tablets use typical Intel or AMD x86-64 processors. |
|
Windows CE Windows Mobile Windows Phone |
Mobile editions such as Windows CE and Windows Phone are currently not supported by Legacy Update. They may work if manually configured to check for updates from Legacy Update’s proxy server. |
Known issues
-
Windows XP/Server 2003: You may need to use a workaround to start Legacy Update setup, due to a bug in Windows XP/Server 2003. Checking for updates for the first time may take up to 15 minutes.
-
Windows Server 2003/2003 R2: Checking for updates for the first time may take between 30 - 60 minutes. If you see the error message “External cab file processing completed with some errors”, simply try checking for updates again.
-
Windows Vista, 7, 8, 8.1: Checking for updates for the first time may take between 30 - 60 minutes.
-
Office 2007, 2010: Having Office 2007 or 2010 installed may cause checking for updates to never complete. There is a workaround for Office 2010.
Legacy Update does not aim to support beta/unreleased versions of Windows. Most did not receive updates through the public Windows Update service, and any updates that do appear are likely not compatible.
Installations of Windows that have modified system files or services may have issues installing updates. Modified files may be reverted when installing updates.
Windows 95, 98, Me, and NT 4
Legacy Update focuses on version 6 of Windows Update, which is still in use today with Windows 10 and 11. As such, we simply proxy protocol traffic to Microsoft’s official Windows Update servers. It seems unlikely that Microsoft will fully discontinue Windows Update for Windows 2000 and later until at least 2034, when Windows Server 2025 reaches end of support.
Earlier versions of Windows never received Windows Update v6, and all versions prior to v6 are now discontinued, making a reimplementation of them more difficult. Fortunately, we work with the Windows Update Restored project, who have revived many of these earlier versions of Windows Update. Check out their work if you’re interested in these earlier versions of Windows.
Windows 2000 Datacenter Server and Windows Server 2003, Datacenter Edition
Due to the unique expectations of datacenter operators, Microsoft excluded Windows 2000 Datacenter Server from using Windows Update. The Windows Update Agent refuses to install on this edition, and even if forced to install, the official Windows Update server and WSUS do not return any updates for Windows itself.
Datacenter editions were sold only to companies making bulk purchases of several servers. This comes with a change in business model - rather than Microsoft providing after-sales support directly to the customer, the server manufacturer would provide all support. This allowed manufacturers to validate compatibility of updates with their hardware before issuing them to customers. Datacenters operate under agreements that guarantee a high quality of service. A server’s reliability being dragged down by an update being installed in the background, restarting at an unexpected time, or becoming unstable due to an incompatible update, would result in angry customers demanding refunds.
Legacy Update can update Windows 2000 Datacenter Server to Service Pack 4 Update Rollup 1 and Internet Explorer 6 SP1. Users who would like to install further updates can use the Windows 2000 Update Archive. However, for most cases, we recommend using Windows 2000 Server or Advanced Server instead.
On Windows Server 2003, Datacenter Edition, Automatic Updates is supported, but the Windows Update website checks for Datacenter Edition and denies access. As we’re confident there are no compatibility concerns, the Legacy Update website removes this check. Starting with Windows Server 2008 Datacenter Edition, the Windows Update restrictions are fully removed, allowing Datacenter servers to install updates in the same way as any other edition of Windows.