End of support information
Note
- Support for Windows Server 2008 R2 has ended
- Windows Server 2008 R2 Premium Assurance ended on January 13, 2026.
- Windows Server 2008 R2 Extended Security Updates (ESU) ended on January 10, 2023. Additionally, Extended Security Updates on Azure only support ended on January 9, 2024. For more information, see Extended Security Updates for Windows Server overview.
- We recommend that you upgrade to a later version of Windows Server. For more information, see Overview of Windows Server upgrades.
Summary
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) makes sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
Important Not installing the latest SSU before applying Windows updates might result in the Windows update not being offered until the latest SSU is installed.
How to get this update
Install this update
To install this update, use one of the following release channels.
| Available | Next Step |
|---|---|
|
This update is available through Windows Update. It will be downloaded and installed automatically. |
| Prerequisites | There are no prerequisites to apply this update. |
|---|---|
| Restart information | You do not have to restart your device after you apply this update. |
| Removal information | Servicing stack updates (SSUs) make changes to how updates are installed and cannot be uninstalled from the device. |
| Update replacement information | This update replaces the previously released update KB5050681. |
File Information
The English (United States) version of this software update installs files that have the following attributes. This update might contain files for additional languages.
For all supported x86-based versions
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| mofinstall.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 59,392 |
| esscli.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 266,240 |
| mofd.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 193,536 |
| repdrvfs.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 302,080 |
| fastprox.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 606,720 |
| wbemcomn.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 363,520 |
| wbemcore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 774,656 |
| wmiutils.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 85,504 |
| wbemprox.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 29,184 |
| xmllite.dll | 1.3.1001.0 | 12-Mar-25 | 20:54 | 180,736 |
| wdscore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 190,464 |
| CntrtextInstaller.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 143,872 |
| drvstore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 324,096 |
| dpx.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 257,024 |
| msdelta.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 305,664 |
| mspatcha.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 35,328 |
| PkgMgr.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 209,920 |
| cmiv2.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 2,046,464 |
| cmitrust.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 297,472 |
| locdrv.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 228,352 |
| WcmTypes.xsd | Not versioned | 3-Mar-25 | 18:22 | 1,047 |
| helpcins.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 105,472 |
| OEMHelpIns.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 151,552 |
| apds.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 1,799,168 |
| apss.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 201,216 |
| apircl.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 223,744 |
| CbsMsg.dll | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 28,672 |
| CbsCore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 846,336 |
| DrUpdate.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 174,080 |
| wrpint.dll | 6.1.7601.27663 | 12-Mar-25 | 20:35 | 54,272 |
| wcp.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 1,913,344 |
| cmiadapter.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 120,832 |
| smiengine.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 697,856 |
| smipi.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 98,816 |
| GlobalInstallOrder.xml | Not versioned | 3-Mar-25 | 18:20 | 1,977,464 |
| poqexec.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 123,904 |
| x86_installed | Not versioned | 3-Mar-25 | 18:20 | 9 |
| SvcIni.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 16,384 |
| wmicmiplugin.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 351,744 |
| ExtendedSecurityUpdatesAI.dll | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 157,184 |
For all supported x64-based versions
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| mofinstall.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 76,800 |
| esscli.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 440,320 |
| mofd.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 280,064 |
| repdrvfs.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 454,144 |
| fastprox.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 909,824 |
| wbemcomn.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 529,920 |
| wbemcore.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 1,220,096 |
| wmiutils.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 137,216 |
| wbemprox.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 43,520 |
| xmllite.dll | 1.3.1001.0 | 12-Mar-25 | 21:46 | 198,656 |
| wdscore.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 271,872 |
| CntrtextInstaller.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 171,008 |
| drvstore.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 423,936 |
| dpx.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 399,872 |
| msdelta.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 452,096 |
| mspatcha.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 46,592 |
| PkgMgr.exe | 6.1.7601.27663 | 12-Mar-25 | 21:14 | 199,168 |
| cmiv2.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 3,749,888 |
| cmitrust.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 479,232 |
| locdrv.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 370,176 |
| WcmTypes.xsd | Not versioned | 12-Mar-25 | 18:47 | 1,047 |
| helpcins.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 142,336 |
| OEMHelpIns.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 222,720 |
| apds.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 2,174,464 |
| apss.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 235,520 |
| apircl.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 276,992 |
| CbsMsg.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 28,672 |
| CbsCore.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 977,408 |
| DrUpdate.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 204,288 |
| wrpint.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 60,928 |
| wcp.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 2,763,264 |
| cmiadapter.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 125,952 |
| smiengine.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 934,400 |
| smipi.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 104,448 |
| GlobalInstallOrder.xml | Not versioned | 3-Mar-25 | 18:21 | 1,977,464 |
| poqexec.exe | 6.1.7601.27663 | 12-Mar-25 | 21:14 | 142,336 |
| amd64_installed | Not versioned | 12-Mar-25 | 18:45 | 9 |
| SvcIni.exe | 6.1.7601.27663 | 12-Mar-25 | 21:14 | 17,920 |
| wmicmiplugin.dll | 6.1.7601.27663 | 12-Mar-25 | 21:46 | 525,824 |
| ExtendedSecurityUpdatesAI.dll | 6.1.7601.27663 | 12-Mar-25 | 21:14 | 197,120 |
| mofinstall.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 59,392 |
| esscli.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 266,240 |
| mofd.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 193,536 |
| repdrvfs.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 302,080 |
| fastprox.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 606,720 |
| wbemcomn.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 363,520 |
| wbemcore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 774,656 |
| wmiutils.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 85,504 |
| wbemprox.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 29,184 |
| xmllite.dll | 1.3.1001.0 | 12-Mar-25 | 20:54 | 180,736 |
| wdscore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 190,464 |
| CntrtextInstaller.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 143,872 |
| drvstore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 324,096 |
| dpx.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 257,024 |
| msdelta.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 305,664 |
| mspatcha.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 35,328 |
| PkgMgr.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 209,920 |
| cmiv2.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 2,046,464 |
| cmitrust.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 297,472 |
| locdrv.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 228,352 |
| WcmTypes.xsd | Not versioned | 3-Mar-25 | 18:22 | 1,047 |
| helpcins.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 105,472 |
| OEMHelpIns.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 151,552 |
| apds.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 1,799,168 |
| apss.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 201,216 |
| apircl.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 223,744 |
| CbsMsg.dll | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 28,672 |
| CbsCore.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 846,336 |
| DrUpdate.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 174,080 |
| wrpint.dll | 6.1.7601.27663 | 12-Mar-25 | 20:35 | 54,272 |
| wcp.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 1,913,344 |
| cmiadapter.dll | 6.1.7601.27663 | 12-Mar-25 | 20:53 | 120,832 |
| smiengine.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 697,856 |
| smipi.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 98,816 |
| GlobalInstallOrder.xml | Not versioned | 3-Mar-25 | 18:20 | 1,977,464 |
| poqexec.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 123,904 |
| x86_installed | Not versioned | 3-Mar-25 | 18:20 | 9 |
| SvcIni.exe | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 16,384 |
| wmicmiplugin.dll | 6.1.7601.27663 | 12-Mar-25 | 20:54 | 351,744 |
| ExtendedSecurityUpdatesAI.dll | 6.1.7601.27663 | 12-Mar-25 | 20:36 | 157,184 |
References
Servicing Stack Updates (SSU): Frequently Asked Questions
Description of the standard terminology that is used to describe Microsoft software updates