that all users subscribing to its service through the Internet Connection Wizard received only Internet Explorer with their subscriptions, Microsoft could nevertheless remove the ISP from the Referral Server if copies of Navigator made up more than the specified percentage of the browsing software that the IAP distributed through all sub-channels. Twenty-five percent was the figure specified in most of the agreements. For Netcom and Sprint, the figure was fifty percent, while for IDT it was fifteen. 259.  In addition to conditioning placement in the Referral Server on an IAP's undertaking to limit its promotion and distribution of non-Microsoft browsing software, Microsoft through its Referral Server agreements exchanged valuable consideration for the commitment of the ten IAPs to convert existing subscribers from Navigator to Internet Explorer. Microsoft also compensated them for employing Internet Explorer-specific technologies whose dissemination would encourage the developers of network-centric applications to focus on APIs controlled by Microsoft, as opposed to Netscape or Sun. For example, in exchange for Netcom's commitment to offer deals to its customers encouraging them to upgrade their software to the newest version that bundled Internet Explorer, Microsoft subtracted nine dollars from the referral fee. Microsoft also deposited one dollar into a co-marketing fund for each Netcom subscriber who actually upgraded to client software that bundled Internet Explorer. 260.  Where the agreement with Microsoft required the IAP to abandon a distribution agreement already entered with Netscape, Microsoft compensated the IAP with additional consideration. For instance, in response to a representation from MCI that