Google has announced that they are discontinuing Google Message Continuity.
Originally launched as a disaster recovery and business continuity solution for Microsoft Exchange customers it received a lukewarm reception from Exchange admins, and according to a Google blog post did not see significant uptake.
In December 2010 we launched an email disaster recovery product for enterprise customers that use Google's cloud to back up emails originally sent or received in an on-premise, Microsoft Exchange system. In the time since we launched, we've seen hundreds of businesses sign up for it. By comparison, in that same time, we've seen millions of businesses move entirely to the cloud with Google Apps, benefitting from disaster recovery capabilities built directly into Apps. Going forward we've decided to focus our efforts on Google Apps and end support for GMC.
Read more at the Official Google blog.