We’ll be shipping another monthly update to our Team Foundation Service on Monday 8/6/12 9 AM - 5 PM PDT. We're are planning to have the service up throughout so you should hopefully not see any noticeable impact of our work. We will, however, disable new account creation in the early stages however. There is also the potential that some builds could take a bit longer to get through the queue to complete.
Keep checking back for updates.
Thank you,
Brian Renggli