Dell And Linux: Not So Much in Love at the End

While the Linux community was getting excited about Dell decision to offer Linux-based hardware models, an official PR cooled it down dramatically.
Dell will NOT offer Linux-based hardware, and will keep having Windows-bundled desktops and notebooks. Dell's relationship with Linux will be limited to a SUSE certification for its hardware models.
One can wonder what kind of arguments Microsoft used to convince Dell to stay with its a Windows-only policy and not to go to the "Linux dark side".