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Current Branch for Business
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Long Term Servicing Branch
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Windows Insider Preview Branch
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Open grade
EXPLANATION
Upgraded builds of Windows 10, known as feature updates,[199] are
occasionally released, containing new features and other changes; in
April 2017, Microsoft stated that in the future, these updates would be
released semi-annually every March and September.[200]
The pace at
which feature updates are received by devices is dependent on which
release channel is used; the default branch for all users of Windows 10
Home and Pro is "Current Branch", (CB) which receives stable builds
after they are publicly released by Microsoft. A 60-day grace period is
provided for each CB build to be rolled out to users before Microsoft
ends support and updates for the previous version.[199] Windows Insider
branches receive unstable builds as they are released, at either a
"Fast" pace (immediately after release) or "Slow" pace (slightly delayed
from their "Fast" release). The Pro and Enterprise editions may
optionally use the "Current Branch for Business" release channel (CBB),
which receives the stable builds on a roughly four-month delay from
their CB release to allow for additional testing.[199][191][201] CBB may
defer build upgrades for up to eight months, after which the new build
must be installed in order to maintain support and access to security
updates.[197] Administrators can also use the "Windows Update for
Business" system to organize structured deployments of updates and build
upgrades across their networks.[191]
Enterprise licensees may use
the Windows 10 Enterprise Long-term Servicing Branch (LTSB)
edition.[199][201] LTSB milestones of Windows 10 are designed for
long-term deployments in specialized environments, and only receive
quality of life updates (i.e. security patches). Each LTSB milestone is
given a full, 10-year support lifecycle. Due to Microsoft's intended use
cases for LTSB builds, certain features, including most Cortana
functionality, Windows Store, and bundled apps, are excluded from
LTSB.[199][175][202][203]Microsoft director Stella Chernyak explained
that "we have businesses [that] may have mission-critical environments
where we respect the fact they want to test and stabilize the
environment for a long time."[204]
SOURCE
https://en.wikipedia.org/wiki/Windows_10#Storage_requirements