The Xbox 360 will be undergoing some scheduled maintenance on June 16th. Xbox.com and Xbox Live will be shut down for awhile, however this will also make Netflix streaming to your Xbox 360 unusable for that period. The maintenance period begins on June 16th at 12:01 a.m. and last until 11:59 p.m. PDT.
Because you won’t be able to access Xbox LIVE or Xbox.com, the Netflix streaming function will be disabled too. You won’t be able to log into your My Xbox section of the website, so the Xbox forums will be locked for that period of time, which means you can only read posts, not create new ones. This is simply a maintenance effort. No upgrades are expected.