Microsoft is suing TiVo over claimed EPG, and secure purchase of VOD content IP infringements in the US.
http://mashable.com/2010/01/20/microsoft-sues-tivo/
http://paidcontent.org/article/419-m...-over-patents/
http://www.multichannel.com/article/...ents_Again.php
http://www.windowsitpro.com/article/...ces-to-US.aspx
Two possible reasons for this, to protect it's own offerings or to reach cross licensing deals and earn some licensing revenue. Either way it should have no immediate impact on VM TiVo launch.