Microsoft’s Hotmail service went down again — major outages occurred in both 2005 and 2007 — this morning, and gave users a “service unavailable” message when they tried logging in. The company did not say what caused the outage, but did confirm this:

“This morning, around 9:30am PST, the Windows Live ID sign-in service experienced a partial outage that caused some customers to not be able to sign into services using Windows Live ID for approximately one hour,” Microsoft said in a statement.”

[via Media-Newswire]