will switch hosting on some of their servers February 7th.  This will affect online features and play on a handful of Ubisoft games. Below is a statement from their official website to further explain what will happen:

Starting February 7, Ubisoft will be transitioning the hosting of many of its online services from a third-party data center to a new facility. During the transition, some Ubisoft services and online games will not be available. We apologize to our customers for the inconvenience. This move ultimately will help us improve the maintenance of our infrastructure and deliver better uptime and greatly improved services for our customers.

These are the Games that will not be affected:

  • Anno 2070 PC
  • Assassin’s Creed Revelations (Onlive,PC, Xbox 360, PS3)
  • Assassin’s Creed RevelationsPC
  • Driver San Francisco PC, Onlive, PS3, Xbox 360
  • Just Dance 3 (Xbox 360, PS3)
  • The Settlers Online (PC web-based)

The following are the games that will be affected:

  • Assassin’s Creed (Mac)
  • Tom Clancy’s H.A.W.X. 2 (PC)
  • Might & Magic : Heroes VI (PC)
  • Splinter Cell Conviction (Mac)
  • The Settlers 7: Paths to a Kingdom (PC)
  • The Settlers (Mac)

Uplay PC will be not be available during the server transition.  No word from Ubisoft on how long this transition could take.

Source: Ubisoft