We released the May Preview of Quality Rollup for the .NET Framework.Preview of Quality Rollup releases are recommended for businesses that want to use and/or preview quality improvements as soon as they become available. These same quality improvements will typically be included in the following Security and Quality Rollup. You can read the .NET Framework Monthly Rollups Explained to learn more about how the .NET Framework is updated.

Quality and Reliability

This release contains 40 fixes from across the following product areas (number of fixes per area included below):

  • ASP.NET (8)
  • BCL (2)
  • CLR (8)
  • Entity Framework (1)
  • Networking (1)
  • SQL Client (4)
  • Windows Forms (1)
  • WPF (15)

Updates were made in the following .NET Framework releases. Release notes have been updated (for versions that have release notes).

Note: This release does not apply to .NET Framework 4.7 and Windows 10. Please install the May 2017 Quality Rollup to get the same fixes if you are using .NET Framework 4.7 and/or Windows 10.


This release does not contain any new security changes.

It contains previously released security changes, including the fixes in the NET Framework May 2017 Monthly Rollup.

Getting the Update

The Preview of Quality Rollup is available via Windows Update, Windows Server Update Services and Microsoft Update Catalog.

Docker Images

The Windows ServerCore and .NET Framework images have not been updated for this release.

Downloading KBs from Microsoft Update Catalog

You can download patches from the table below. See .NET Framework Monthly Rollups Explained for an explanation on how to use this table to download patches from Microsoft Update Catalog.

Product Version Preview of Quality Rollup KB
Windows 8.1
Windows Server 2012 R2
.NET Framework 4.6, 4.6.1, 4.6.2 4014604
.NET Framework 4.5.2 4014611
.NET Framework 3.5 4014598
Windows Server 2012 Catalog
.NET Framework 4.6, 4.6.1, 4.6.2 4014602
.NET Framework 4.5.2 4014612
.NET Framework 3.5 4014594
Windows 7
Windows Server 2008 R2
.NET Framework 4.6, 4.6.1, 4.6.2 4014606
.NET Framework 4.5.2 4014613
.NET Framework 3.5.1 4014596
Windows Server 2008 Catalog
.NET Framework 4.6 4014606
.NET Framework 4.5.2 4014613
.NET Framework 2.0 4014592

Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:

Note: Previously released security and quality updates are included in today’s release.

Source: .NET Framework May 2017 Preview of Quality Rollup | .NET Blog