They include the following:
Kelleher indicated if a user currently has a licensed copy of a retail version of Windows 7 or Windows 8.1 (but not enterprise) they can reserve themselves a free copy. Users with a licensed version of Windows 7 or 8.1 home or pro will be able to upgrade to the same version of Windows 10 through Windows Update. Some hardware or software requirements apply and feature availability may vary by device and market.
However, Kelleher claimed the availability of Windows 10 upgrade for Windows Phone 8.1 devices may vary by OEM, mobile operator or carrier. Devices must be connected to the Internet and have Windows Update enabled.
He said the software is free for the supported lifecycle of Windows 10 as it is a full and fully supported product.
Kelleher claimed the full version will be available from July 29 but suggested users have a good Internet connection as it will be about a 3GB download.
If a user is currently running one of the CTP (Community Technology Preview) versions, he said it will not convert itself into the full version. Users will have to download that and install it fresh, or to an eligible Windows 7 or 8.1 system.
According to Kelleher, if a user is already running the most recent version of Windows, they should have started receiving notices from Microsoft to reserve their version of Windows 10.
Kelleher claimed if running a network, a business might want to control the updates for their organisation themselves.
He mentioned users will not be able to download an ISO officially. On the official website, it states users can create a USB or DVD media to do a fresh install after they upgrade their eligible device to Windows 10.
"There are various tweets from Microsoft employees that say you can, but that is not on the official website," he said.
He also added that users on an existing Windows 7 or Windows 8.1 license will not need a new license key but will have to have on hand their current key.
In addition, users that intend to downgrade from Windows 10 will be able to do so in the event that they choose to not use the platform.
But Kelleher also claimed there's a downside to Windows 10.
"There are some apps in Windows 7 or 8.1 that won't be there in Windows 10. For example, Windows Media Center will be gone but it will come with a DVD player. Also, vendor apps may not be compatible with Windows 10, so you should consult the individual app sites to check for compatible versions, and expect Windows software to be updated to the latest version.
"Desktop gadgets from Windows 7 will be no more too," he added.