DISM offline vs online

What is the main difference between DISM offline vs DISM online
tike55Asked:
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JohnBusiness Consultant (Owner)Commented:
DISM offline requires you to have the dism source files that will fix Windows on your computer.
DISM online will get the files it needs online while it is running.
Unless you have some reason to be offline, run DISM online. Easier and more likely to have no problems.
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McKnifeCommented:
?
Offline/online has nothing to do with being offline or online (=internet access). It tells the dism command to work with the current system (=online) or with an offline image (=offline).
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JohnBusiness Consultant (Owner)Commented:
Offline needs the source files to be present (which sometimes are not). Online does go out and get the new files if need be.
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Cliff GaliherCommented:
Agree with McKnife. Online works with the currently running OS. Offline works with WIM files that are not actively running.
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Cliff GaliherCommented:
No John. That's "features on demand" and has to do with the /source flag. Totally different.
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MichelangeloConsultantCommented:
Online parameter means current operating system, windows directory automatically detected:
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/dism-global-options-for-command-line-syntax

If you are servicing a running computer, you can use the /Online option instead of specifying the location of the offline Windows image. The commands and options that are available for servicing an image depend on which Windows operating system you are servicing. They also depend on whether the image is offline or a running operating system. All commands work on an offline Windows image. Subsets of the commands are available for servicing a running operating system.
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Windows Server 2012

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