it had already committed to pay Netscape between five and ten million dollars for Web browsing software, Microsoft agreed to grant MCI a credit of five dollars toward a co-marketing fund (not to exceed five million dollars) for each copy of Internet Explorer that MCI distributed to an MCI Internet access customer who had not already received a copy. Finally, Microsoft offered yet further reductions in referral fees to the IAPs using Microsoft-controlled technologies likely to stimulate developers to focus their attention on Windows-specific software interfaces rather than the cross- platform ones provided by Netscape and Sun. For example, Microsoft offered to reduce EarthLink's per-copy referral fee by ten dollars in exchange for EarthLink's use of at least two ActiveX controls in the design of its home page and the use of Microsoft FrontPage server extensions on its Web hosting servers. 261.  Microsoft could have covered the cost of developing and maintaining the ICW and the Windows Referral Server, and even made a profit, by charging higher referral fees than it did to the favored IAPs. Instead, Microsoft bartered away so much of the referral fees it otherwise could have charged that the costs of running the Windows Referral Server have thus far exceeded the payments Microsoft has received from the favored IAPs. Microsoft readily made this sacrifice in order to induce the important IAPs to take actions that aided Microsoft's effort to exclude Navigator from the IAP channel. 262.  Microsoft's motivation for the limits it placed on the distribution