Hi! Ubuntu One will be moving from https://ubuntuone.com to https://one.ubuntu.com later today.
Expect a few minutes of downtime, and ubuntuone.com will be set up to redirect to one.ubuntu.com to avoid breaking old links, etc. We’ve tried to plan things carefully to make it go as smoothly as possible, but there may be a bump or two during the transition. We’re doing the move now before Ubuntu 9.10 (Karmic) goes into beta so that we can minimize the impact on users.
This doesn’t imply any servers moving, or any data shifting around, so no risk to user data. As mentioned before, the web UI will be offline for a few minutes but the background syncing of your files should not be affected as we’ll keep some servers running at the old addresses for a couple of weeks to give everyone time to update to the new packages.
If you run into any problems related to the move or Ubuntu One in general, as always please let us know by filing bugs at https://bugs.launchpad.net/ubuntuone/+filebug