Microssofts official answers - sort of ...
Just some comments and a couple of Microsoft published links on their website that "sort of" answers the question for clean Hard drive installs with upgrade media.
According to my understanding of the link below, reinstalls and custom installs should be able to be started by booting from the DVD, and though the statement is not absolute (can we say ambiguous), the last section appears to include blank hard drives. (And, there is no mention of having to run upgrade install
only from an activated version of Windows.)
Installing and reinstalling Windows
"-Installing a custom version of Windows. Choose Custom to completely replace your current operating system, or to install Windows on a specific drive or partition that you select. You can also use Custom if your computer does not have an operating system, or if you want to set up a multiboot system on your computer. For more information about setting up a multiboot system, see
Install more than one operating system (multiboot)
"-Reinstalling Windows 7. Choose this option if you want to restore default Windows settings or if you are having trouble with Windows and need to reinstall it by performing a custom installation."
Later on page:
"Here's how to reinstall Windows using the original installation disc:
1. Turn on your computer and insert the Windows 7 DVD or CD.
2. On the Install Windows page, follow any instructions that might appear, and then click Install now.
3. On the Get important updates for installation page, we recommend getting the latest updates to help ensure a successful installation and to help protect your computer against security threats. You need an Internet connection to get installation updates.
4. On the Please read the license terms page, if you accept the license terms, click I accept the license terms.
5. Follow the instructions on each page. On the Which type of installation do you want? page, click Custom.
6. On the Where do you want to install Windows? page, select the partition where you want to install Windows.
7. Click Next to begin the installation.
8. Follow the instructions to finish installing Windows 7."
Of coarse, I'll believe it when I've actually had a chance to try it myself and/or get an actual report from a reliable technical person who has actually tested with upgrade media.
I find it amazing that Windows 7 is in RTM and yet there appears to be no one with a copy of the upgrade media. I have to assume that like prior versions of Windows the full and upgrade media is actually the same and the difference is the serial numbers.
And, I hope that many good class action lawyers have already culled the published page above, and the many misleading and outright incorrect statements made by MVPs in MS's official forums over the last 6-9 month's. There are just too many that contradict the link above.
As to what qualify's as an upgrade (license wise) see:
Windows 7 - Buy and download from Microsoft Store
It has stated since at least the start of the June to July 10th pre-order sale that Windows 2000, Windows XP and Windows Vista qualify for upgrade. It states no version restrictions. So, any version of Vista should qualify as upgrade to any version of Windows 7, not same version or better as other posters have stated.
From above page:
"
Currently running Windows Vista
Customers with Windows Vista can purchase Windows 7 Upgrade versions. You can do a clean install (back up your files, clean install, and then reinstall your applications) or an in-place upgrade (Windows 7 installs over Windows Vista)."
Frankly I could read that statement to promise an in-place upgrade from Vista Home Basic 32 bit to any version of Windows 7 32 or 64 bit. (But, I'll let the lawyers work out if that is what is promised.) And, I understand that most upgrade installs will actually be "custom" rather than in-place.
The 64 bit FAQ is more specific on the custom install issue.
32-bit and 64-bit Windows: frequently asked questions
There is also a chart first published here:
Deciphering Windows 7 Upgrades: The Official Chart | Walt Mossberg | Mossblog | AllThingsD
That chart appears to give an accurate run down of what can be in-place upgraded and what must be "custom" upgrade. But, I personally find a few flaws in the "official-ness" of the chart.
First the MS source is not stated, second the footnote states that Windows 2000 does not qualify as an upgrade (in conflict with MS store statement above).
Third, I can think of no technical reason that Vista Home (Basic or Premium) cannot be in-place upgraded to Windows 7 Business, but can be in-place upgraded to Ultimate. But, since the article does not identify the MS "source", I have to consider it still an unofficial chart. Besides, if official, why is it not on the Microsoft.com Windows 7 pages?
Finally, the best one for the lawyers is here:
Can my PC run Windows 7?
Quote at bottom is what I love:
"While we don't recommend it, you can opt to upgrade your current PC from Windows XP or another operating system to Windows 7. We recommend that you get help with this process from your local computer service provider. You'll need to back up your current files and settings, perform a custom (clean) installation, and then reinstall your files, settings, and programs."
That statement has been up since at least early July. Guess that qualifies any OS as an upgrade path to Windows 7.
Now where did I put my copy of Caldera Linux, BeOS and Windows 3.1? (Again, we'll let the lawyers have a field day with that statement.)
Hope this sheds some light on the official Microsoft answers regarding upgrade media installation procedures. It certainly shows that there are conflicting statements. Microsoft could have a major class action lawsuit over not fully and accurately publishing clear answers to the questions raised in this and many other forums.
I personally intend keep my pre-order sale upgrades. And, make Microsoft stand behind their published web pages on qualifying upgrades and installation/re-installation of those upgrades.
