Friday, 20 January 2012 12:12
CRM 2011 RU6 was released on Jan,12th but has been removed this weekend from the download center due to an issue with Outlook sync, so be sure NOT to install it on any production environments.
The reschedule date is foreseen for the 24th, but it's unconfirmed at the time I write this post
Link to the RU6 KB Article : http://support.microsoft.com/kb/2600640
Btw, the update to the SDK (5.0.9) released on the 17th is available on this link: http://www.microsoft.com/download/en/details.aspx?id=24004