Differences between B, C, and out-of-band (OOB) Windows Updates


  • Staff
As we advance towards general availability of Windows 11 this holiday, we thought it was a good time for a refresher on Windows monthly quality updates. Windows monthly quality updates help you stay productive and protected. They provide consumers and IT administrators alike with the security fixes they need to protect devices before unpatched vulnerabilities can potentially be exploited. Monthly quality updates are cumulative and include all previously released fixes to guard against fragmentation of the operating system (OS), which can lead to reliability and vulnerability issues when only a subset of fixes is installed.

To ensure that this information is easy to find when needed, you can now find a topic on Monthly quality updates in our Windows technical documentation. It defines the different types of monthly quality updates – specifically B, C, and out-of-band (OOB) releases – and describes their role for consumers and enterprises alike. I'll also summarize that information here.

Update Tuesday – aka "B" releases

For many of you, Update Tuesday (also referred to as "Patch Tuesday") is a regular part of Windows servicing. Published on the second Tuesday of each month, our "B" releases are cumulative, including both new and previously released security fixes along with non-security content introduced in the prior month’s Preview “C” release (see below for details). These updates help keep Windows devices secure and compliant by deploying stability fixes and addressing security vulnerabilities.

“B” releases are mandatory and are available through our standard channels, which include Windows Update, Windows Server Update Services (WSUS), and the Microsoft Update Catalog.

Optional previews – aka "C" releases

If you want to test and/or validate production-quality releases ahead of the planned “B” release for the following month, you can leverage “C” releases, which are optional, cumulative, non-security preview releases. “C” releases are only offered for the most recent, supported versions of Windows. New features like News and Interests may initially be deployed in the prior month’s “C” preview release, then ship in the following month’s “B” release.

To access “C” releases, navigate to Settings > Update & Security > Windows Update and select Check for updates.

IT admins may also validate fixes and features in a preview update by leveraging the Windows Insider Program for Business or via the Microsoft Update Catalog.

Out-of-band releases

Out-of-band releases may be provided to fix a recently identified issue or vulnerability. They are used in atypical cases, such as security vulnerabilities or a quality issue, when devices should be updated immediately instead of waiting for the next monthly quality update release.

Recommendations

As a general practice, we recommend that both consumers and commercial customers patch their devices as soon as possible. For IT admins, we also recommend taking advantage of “C” preview releases to internally validate releases ahead of the following month’s “B” release.

Learn more

To help manage updates across your organization, be sure to also check out these resources:
If you are a Microsoft Partner or registered commercial customer, you can also take advantage of the Security Update Validation Program (SUVP), a quality assurance testing program geared toward the “B” release. SUVP partners can start testing these security updates three weeks prior to Update Tuesday and provide us with feedback regarding usability, bug reports, test reports, etc. For more details on the SUVP, see Security Update Validation Program: the early bird tests the worm.


Source: Windows quality updates primer
 

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"As we advance towards general availability of Windows 11 this holiday, "

@Brink: Any idea what holiday they are referring to?
 

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System One

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    Windows 10 21H1
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    Dell XPS 8920
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    Intel Core i7-7700
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    32GB
    Graphics Card(s)
    Radeon RX 560D
"As we advance towards general availability of Windows 11 this holiday, "

@Brink: Any idea what holiday they are referring to?

Usually this means Christmas holiday, so it should be towards the end of this year.

Rumors are saying around October 2021 so far.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
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    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
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    ASUS ROG Maximus XI Formula Z390
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    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
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    Integrated Digital Audio (S/PDIF)
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    2 x Samsung Odyssey G75 27"
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    1TB Samsung 990 PRO M.2,
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    Thermaltake Core P3 wall mounted
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    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S23 Plus phone
  • Operating System
    Windows 11 Pro
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    Manufacturer/Model
    HP Spectre x360 2in1 14-eu0098nr (2024)
    CPU
    Intel Core Ultra 7 155H 4.8 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
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    Integrated Intel Arc
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    Poly Studio
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    14" 2.8K OLED multitouch
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    2880 x 1800
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    2 TB PCIe NVMe M.2 SSD
    Internet Speed
    Intel Wi-Fi 7 BE200 (2x2) and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Windows Defender and Malwarebytes Premium
Christmas ~ October

Sounds like MS uses the same calendar as Lowe's seasonal goods displays.... :rolleyes:
 

My Computer

System One

  • OS
    Windows 10 21H1
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell XPS 8920
    CPU
    Intel Core i7-7700
    Memory
    32GB
    Graphics Card(s)
    Radeon RX 560D
Christmas ~ October

Sounds like MS uses the same calendar as Lowe's seasonal goods displays.... :rolleyes:
It's not just Lowe's. All chain stores start way to early.
 

My Computers

System One System Two

  • OS
    Windows 11 Canary Channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec B746
    CPU
    Intel Core i7-10700K
    Motherboard
    ASRock Z490 Phantom Gaming 4/ax
    Memory
    16GB (8GB PC4-19200 DDR4 SDRAM x2)
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    NVIDIA GeForce GTX 1050 TI
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    Samsung SAM0A87 Samsung SAM0D32
    Screen Resolution
    1920 x 1080
    Hard Drives
    NVMe WDC WDS100T2B0C-00PXH0 1TB
    Samsung SSD 860 EVO 1TB
    PSU
    750 Watts (62.5A)
    Case
    PowerSpec/Lian Li ATX 205
    Keyboard
    Logitech K270
    Mouse
    Logitech M185
    Browser
    Microsoft Edge and Firefox
    Antivirus
    ESET Internet Security
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    Windows 11 Canary Channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    PowerSpec G156
    CPU
    Intel Core i5-8400 CPU @ 2.80GHz
    Motherboard
    AsusTeK Prime B360M-S
    Memory
    16 MB DDR 4-2666
    Monitor(s) Displays
    23" Speptre HDMI 75Hz
    Screen Resolution
    1920x1080
    Hard Drives
    Samsung 970 EVO 500GB NVMe
    Mouse
    Logitek M185
    Keyboard
    Logitek K270
    Browser
    Firefox, Edge and Edge Canary
    Antivirus
    Windows Defender
Usually this means Christmas holiday, so it should be towards the end of this year.

Rumors are saying around October 2021 so far.

That's rather fast for a new OS release - We got the beta in June and the final is supposed to be release by end of 2021. That sounds to me like it was originally supposed to be a Windows 10 upgrade/update, but instead morphed into a new OS called Windows 11.
 

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    Windows 11 Pro 23H2 (Build 22631.3296)
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    Custom built
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    Intel i9-9900K
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    Gigabyte Aorus Z390 Xtreme
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    32G (4x8) DDR4 Corsair RGB Dominator Platinum (3600Mhz)
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    Radeon VII
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    Onboard (ESS Sabre HiFi using Realtek drivers)
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    NEC PA242w (24 inch)
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    1920 x 1200
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    5 Samsung SSD drives: 2X 970 NVME (512 & 1TB), 3X EVO SATA (2X 2TB, 1X 1TB)
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    Cooler Master H500M
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    Corsair H115i RGB Platinum
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    Logitech Craft
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    Logitech MX Master 3
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    500mb Download. 11mb Upload
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    Microsoft Edge Chromium
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    Windows Security
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    System used for gaming, photography, music, school.
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    Win 10 Pro 22H2 (build 19045.2130)
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    PC/Desktop
    Manufacturer/Model
    Custom Built
    CPU
    Intel i7-7700K
    Motherboard
    Gigabyte GA-Z270X-GAMING 8
    Memory
    32G (4x8) DDR4 Corsair Dominator Platinum (3333Mhz)
    Graphics card(s)
    AMD Radeon R9 Fury
    Sound Card
    Onboard (Creative Sound Blaster certified ZxRi)
    Monitor(s) Displays
    Dell U2415 (24 inch)
    Screen Resolution
    1920 x 1200
    Hard Drives
    3 Samsung SSD drives: 1x 512gig 950 NVMe drive (OS drive), 1 x 512gig 850 Pro, 1x 256gig 840 Pro.
    PSU
    EVGA Super Nova 1000 P2 (1000 watt)
    Case
    Phantek Enthoo Luxe
    Cooling
    Corsair H100i
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    Logitech MX Master
    Keyboard
    Logitech MK 710
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    100MB
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    Edge Chromium
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    Windows Security
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    This is my backup system.
That's rather fast for a new OS release - We got the beta in June and the final is supposed to be release by end of 2021. That sounds to me like it was originally supposed to be a Windows 10 upgrade/update, but instead morphed into a new OS called Windows 11.
It's basically project "Sun Valley" from Windows 10 now Windows 11.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master 3
    Internet Speed
    1 Gbps Download and 35 Mbps Upload
    Browser
    Google Chrome
    Antivirus
    Microsoft Defender and Malwarebytes Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S23 Plus phone
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 2in1 14-eu0098nr (2024)
    CPU
    Intel Core Ultra 7 155H 4.8 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Graphics card(s)
    Integrated Intel Arc
    Sound Card
    Poly Studio
    Monitor(s) Displays
    14" 2.8K OLED multitouch
    Screen Resolution
    2880 x 1800
    Hard Drives
    2 TB PCIe NVMe M.2 SSD
    Internet Speed
    Intel Wi-Fi 7 BE200 (2x2) and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Windows Defender and Malwarebytes Premium
It's basically project "Sun Valley" from Windows 10 now Windows 11.

Yeah, didn't remember the name, but I do remember there was supposed to be a new UI refresh coming to Windows 10 later this year. I guess they decided to build a new OS around it. Also explains the speed to which Windows 11 is being released.

Thanks (y)
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 23H2 (Build 22631.3296)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom built
    CPU
    Intel i9-9900K
    Motherboard
    Gigabyte Aorus Z390 Xtreme
    Memory
    32G (4x8) DDR4 Corsair RGB Dominator Platinum (3600Mhz)
    Graphics Card(s)
    Radeon VII
    Sound Card
    Onboard (ESS Sabre HiFi using Realtek drivers)
    Monitor(s) Displays
    NEC PA242w (24 inch)
    Screen Resolution
    1920 x 1200
    Hard Drives
    5 Samsung SSD drives: 2X 970 NVME (512 & 1TB), 3X EVO SATA (2X 2TB, 1X 1TB)
    PSU
    EVGA Super Nova I000 G2 (1000 watt)
    Case
    Cooler Master H500M
    Cooling
    Corsair H115i RGB Platinum
    Keyboard
    Logitech Craft
    Mouse
    Logitech MX Master 3
    Internet Speed
    500mb Download. 11mb Upload
    Browser
    Microsoft Edge Chromium
    Antivirus
    Windows Security
    Other Info
    System used for gaming, photography, music, school.
  • Operating System
    Win 10 Pro 22H2 (build 19045.2130)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom Built
    CPU
    Intel i7-7700K
    Motherboard
    Gigabyte GA-Z270X-GAMING 8
    Memory
    32G (4x8) DDR4 Corsair Dominator Platinum (3333Mhz)
    Graphics card(s)
    AMD Radeon R9 Fury
    Sound Card
    Onboard (Creative Sound Blaster certified ZxRi)
    Monitor(s) Displays
    Dell U2415 (24 inch)
    Screen Resolution
    1920 x 1200
    Hard Drives
    3 Samsung SSD drives: 1x 512gig 950 NVMe drive (OS drive), 1 x 512gig 850 Pro, 1x 256gig 840 Pro.
    PSU
    EVGA Super Nova 1000 P2 (1000 watt)
    Case
    Phantek Enthoo Luxe
    Cooling
    Corsair H100i
    Mouse
    Logitech MX Master
    Keyboard
    Logitech MK 710
    Internet Speed
    100MB
    Browser
    Edge Chromium
    Antivirus
    Windows Security
    Other Info
    This is my backup system.

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