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For some strange reason, after installing the Windows Live Messenger 2009 Beta - I was getting an error called 8000ffff - I tried many solutions posted online but in vain. Finally, I felt my Messenger 8.1 was much better and there my hunt for the uninstaller began. I searched high and low but in vain.
Finally, I found an easy method to Uninstall Windows Live Messenger 2009 Beta. Goto Start > Run and type the following command and press enter - this starts the uninstaller.
msiexec /x {B1403D7D-C725-4858-AACC-7E5FA2D72859}
How funny?
Btw, for the other Live Beta softwares - here are the codes to uninstall.
To UnInstall Windows Live Mail Beta Easily
msiexec /x {DFD6935E-D94A-4DBE-AD8F-E37CBC6B577F}
To UnInstall Windows Live Toolbar Beta Easily
msiexec /x {5524A0D4-F826-4961-9B53-EFF6C615251B}
To UnInstall Windows Live Writer Beta Easily
msiexec /x {AC5568AB-C3E3-490E-BE40-50977C12288D}
To Uninstall Windows Live Photo Gallery Beta Easily
msiexec /x {F6D0986F-D9A8-479B-A80F-61D53CDF65BA}
To Uninstall Windows Live Family Safety Beta Easily
msiexec /x {3491D278-AF52-4A0E-A1F5-D1A57B4F2222}