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
 

Attachments

  • Windows_11_flag.png
    Windows_11_flag.png
    2.6 KB · Views: 2

martyfelker

Member
VIP
Local time
4:36 PM
Posts
75

My Computer

System One

  • Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    Eluktronics Max 17
    CPU
    Intel Core i7 @ 2300MHz
    Motherboard
    AMI

mta3006

Member
Local time
4:36 PM
Posts
3
"As we advance towards general availability of Windows 11 this holiday, "

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

My Computer

System One

  • Operating System
    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

Brink

Administrator
Staff member
MVP
Thread Starter
Local time
3:36 PM
Posts
1,425
"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

  • Operating System
    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
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 980 PRO M.2,
    1TB Samsung 970 EVO Plus M.2,
    6TB WD Black WD6001FZWX
    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,
    Linksys EA9500 router,
    Motorola MB8611 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S20 Ultra 5G phone
  • Operating System
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 2in1
    CPU
    i7-1065G7 3.9 GHz
    Memory
    16 GB LPDDR4-3200
    Graphics card(s)
    Intel Iris Plus
    Sound Card
    Intel SST
    Monitor(s) Displays
    13.3" 4K UWVA AMOLED multitouch
    Screen Resolution
    3840 x 2160
    Hard Drives
    512 GB PCIe NVMe M.2 SSD
    Browser
    Google Chrome
    Antivirus
    Windows Defender and Malwarebytes Premium

mta3006

Member
Local time
4:36 PM
Posts
3
Christmas ~ October

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

My Computer

System One

  • Operating System
    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

Winuser

Well-known member
Power User
VIP
Local time
4:36 PM
Posts
974
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 Computer

System One

  • Operating System
    Windows 11
    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)
    Graphics Card(s)
    NVIDIA GeForce GTX 1050 TI
    Sound Card
    Realtek Audio
    Monitor(s) Displays
    Samsung SAM0A87
    Screen Resolution
    1920 x 1080
    Hard Drives
    NVMe WDC WDS100T2B0C-00PXH0 1TB
    Samsung SSD 860 EVO 1TB
    Keyboard
    HP USB Kekboard
    Mouse
    2.4 wireless mouse
    Browser
    Microsoft Edge and Firefox

Dru2

Well-known member
Member
VIP
Local time
4:36 PM
Posts
624
Location
Virginia
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.
 

My Computers

System One System Two

  • Operating System
    Win 10 Pro (x64) 21H1 (19043.1055)
    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 P2 (1000 watt)
    Case
    Cooler Master H500M
    Cooling
    Corsair H115i RGB Platinum
    Keyboard
    Logitech Craft
    Mouse
    Logitech MX Master 2S
    Internet Speed
    100mb
    Browser
    Edge Chromium
    Antivirus
    Windows Security
    Other Info
    System used for gaming and photography.
  • Operating System
    Win 11 Pro Dev build 22454.1000
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo ThinkPad Yoga X1
    CPU
    Intel i7-7600U
    Motherboard
    Intel
    Memory
    16igg
    Graphics card(s)
    Intel HD 620
    Sound Card
    Onboard
    Monitor(s) Displays
    14.0 WQHD OLED Touch
    Screen Resolution
    2560 x 1440
    Hard Drives
    1TB NVMe Drive (OEM)
    PSU
    laptop
    Case
    laptop
    Cooling
    Laptop cooling
    Mouse
    Logitech MX Anywhere 2S
    Keyboard
    Laptop
    Internet Speed
    100MB
    Browser
    Edge Chromium
    Antivirus
    Windows Security

Brink

Administrator
Staff member
MVP
Thread Starter
Local time
3:36 PM
Posts
1,425
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

  • Operating System
    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
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 980 PRO M.2,
    1TB Samsung 970 EVO Plus M.2,
    6TB WD Black WD6001FZWX
    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,
    Linksys EA9500 router,
    Motorola MB8611 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S20 Ultra 5G phone
  • Operating System
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 2in1
    CPU
    i7-1065G7 3.9 GHz
    Memory
    16 GB LPDDR4-3200
    Graphics card(s)
    Intel Iris Plus
    Sound Card
    Intel SST
    Monitor(s) Displays
    13.3" 4K UWVA AMOLED multitouch
    Screen Resolution
    3840 x 2160
    Hard Drives
    512 GB PCIe NVMe M.2 SSD
    Browser
    Google Chrome
    Antivirus
    Windows Defender and Malwarebytes Premium

Dru2

Well-known member
Member
VIP
Local time
4:36 PM
Posts
624
Location
Virginia
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

  • Operating System
    Win 10 Pro (x64) 21H1 (19043.1055)
    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 P2 (1000 watt)
    Case
    Cooler Master H500M
    Cooling
    Corsair H115i RGB Platinum
    Keyboard
    Logitech Craft
    Mouse
    Logitech MX Master 2S
    Internet Speed
    100mb
    Browser
    Edge Chromium
    Antivirus
    Windows Security
    Other Info
    System used for gaming and photography.
  • Operating System
    Win 11 Pro Dev build 22454.1000
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo ThinkPad Yoga X1
    CPU
    Intel i7-7600U
    Motherboard
    Intel
    Memory
    16igg
    Graphics card(s)
    Intel HD 620
    Sound Card
    Onboard
    Monitor(s) Displays
    14.0 WQHD OLED Touch
    Screen Resolution
    2560 x 1440
    Hard Drives
    1TB NVMe Drive (OEM)
    PSU
    laptop
    Case
    laptop
    Cooling
    Laptop cooling
    Mouse
    Logitech MX Anywhere 2S
    Keyboard
    Laptop
    Internet Speed
    100MB
    Browser
    Edge Chromium
    Antivirus
    Windows Security
Top Bottom