Potential Data Loss with Windows Mail
Existing Windows Mail settings AND Data will NOT migrate successfully from Beta 2 to 5456. Be sure to use Windows Easy Transfer to save any Windows Mail data you care about before upgrading. You will receive an error message when first booting into 5456.5 that says “Unable to upgrade your message databases.” Once the upgrade completes you can restore your Windows Mail settings and data using Windows Easy Transfer.

Last Logged in User Changed on Upgrade
When upgrading from Beta 2 to 5456, the last logged in username shown at the logon screen after completing the upgrade will be Administrator. You will need to click the “Switch User” button to login as your user account.

Xbox 360 as a Media Center Extender
Support for Xbox 360 as a Media Center extender is not included in this Vista build. In order to continue using the Xbox 360 as a Media Center Extender with Vista, please remain on Beta 2 (build 5384). Support for the Xbox 360 as an Extender will be available in a future Vista build.

Pseudo Localized Text Present
Parts of the OS contain Pseudo-localized text, or non-english characters placed together to approximate English words. (Text that looks similar to the following: “Щĭηđбш§ Мèðìα Þĺäÿёя”) This is used internally, is known and being addressed in future builds.

Username with a . generates error
On a clean install, during OOBE, if you add a username which contains a period (.) in it, you will receive an error message after hitting next that says your computer name is invalid. You will need to remove the period from the computer name to continue. This is set to be fixed in a future build.

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