As we reported last week, Microsoft has sent out beta invites for testers to give the upcoming Windows 7 SP 1 a go. The beta's been sent out and is now live for those who get to try it (or who find another ways of obtaining it).
According to Ars Technica, the build number is 7601.16562.100603-1800, meaning it was compiled on June 3, 2010 at 6 p.m. Furthermore, support items have appeared on Microsoft's website for those who are having troubles installing the SP1 beta, which confirms the availability of the test patch.
As Microsoft previously indicated, SP1 will not offer Windows 7-specific features, but rather serves as a culmination of updates released since the OS hit the market--a few additional hotfixes thrown into the mix.
For Windows Server 2008 R2, the new service pack will provide RemoteFX, a 3D graphical experience for remote users, and Dynamic Memory, a feature that allows Windows Server Hyper-V to "dynamically allocate more or less memory to each VM as needed, provided a more scalable and better performing VDI environment."
The public release of SP1 is slated for later this year.