Regarding single source other risks, made changes
to the first sentence (to reflect the multiple risks),
and the last sentence (because I wasn't happy with it).

Multisourcing
-------------
Single sourcing products means accepting several risks,
including the risk that the single source will become abusive.
Recently, Microsoft was found guilty by the Department
of Justice of abusing its monopoly power. Maricopa County
has a clause (MC1-902) in its procurment procedure to
deal with such vendors, but Maricopa County is currently
too dependant to even consider invoking the clause with
Microsoft. What efforts are being made to mitigate
Maricopa County's dependance on a single source which
has been found guilty of abusing dependant customers?