Hello,
In order to be legal, you need to have a valid serial number for licensing. Media (source install files) are not important... it is the license number that binds you to the agreement with Microsoft. Your people (clients) need to provide this information either with license numbers that they purchased, or by purchasing new media and licensing codes. If they do not like that, they can either call Microsoft and make their case, or start thinking about Linux.
It is not legal for you to install with your own personal codes. You could use your media, but you have to use the software licenses that they purchased.
Chrstian
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