The letters will list the seven areas where the FSF says Microsoft and the commercial software market is damaging:
locking users in,
leveraging monopolistic behaviour,
enforcing Digital Restrictions Management (DRM),
and threatening user security.
Bill gates made a lot of money from Microsoft.
Bill Gates has a net worth of $50 billion.
This is more than the gross domestic product (GDP) of Costa Rica or El Salvador or Bolivia or Uruguay.
It is bigger than the GDP of 140 countries. (America's Richest:Countries Billionaires Could Buy)
The CIA may have found Gates useful.
Microsoft's chief security strategist Scott Charney says (No back doors for CIA in our code: Microsoft - theage.com.au):
"Let assume we put a back door in, do you think it wouldn't be discovered? Look how many people are probing and testing our products.
"If it was discovered, what do you think our long-term business survivability would be? I think it would be zero."
In 2002, the CIA admitted using an illegal 'snooper cookie' to tail people who visited its website. (CIA used illegal snooper cookie - V3.co.uk - formerly vnunet.com )
The cookie informed the CIA about all the websites users visited for years after it was installed on a PC.
Such cookies are banned by the US government.
But the snooper software was found by Daniel Brandt, president of Public Information Research.
The CIA admitted having the cookie installed on its site.