Performing inline upgrade of Windows Server 2012 to Windows Server 2012 R2 ?

People,

I've got Windows WDS/MDT server that is on physical box running Windows Server 2012, it kept on failing on Windows Update, so I wonder how to perform upgrade to Windows Server 2012 R2 standard without losing the current settings and application ?

The C: drive is just 30 GB free out of 68 GB
Note: the C: drive is just RAID-1 from 2x 72 GB HDD.
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Senior IT System EngineerIT ProfessionalAsked:
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Zephyr ICTCloud ArchitectCommented:
You should be able to run the setup,exe from within your current Windows version when either copying the iso to this server or using a DVD/USB ...

Once you run setup it will ask you if you want to "Upgrade: Install Windows and keep files, settings and applications"

Here is a Technet article that gives more info on the possible upgrade paths. Just make sure you're not using something that would possibly block the upgrade (eg, something that is not compatible with 2012R2), this will probably not be the case, but better be warned ;-)
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks man,
yes the upgrade went smoohtly succesful.

so can I delete the C:\Windows.old directory now ?
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Zephyr ICTCloud ArchitectCommented:
If you don't need it anymore you can delete it yes, but follow Microsofts guide for doing it, you can find it here: http://windows.microsoft.com/en-us/windows7/how-do-i-remove-the-windows-old-folder
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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Senior IT System EngineerIT ProfessionalAuthor Commented:
What about if the C: drive is just 25 GB free ?
is that going to work ?
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