When setting up Windows Live Essentials, the setup installer might fail with one of following error code.
Solution: See Error 0×80070643 When Install Windows Live Essentials
Solution: Turn on Windows Firewall
0x8104000b Source WaitForCatalog
When you upgrade Office 2010 from BETA to RTM, you might get Error 1731 the source installation package for the product Microsoft Office Office 64-bit Components 2010 is out of sync with the client package as shown in this screenshot.
Windows Live Messenger cannot be installed on Windows Server 2003 and Windows XP Professional x64 Edition. It seems that these OS are blocked in Windows Live Messenger setup.
Eventually I found this blog Install Windows Live Messenger 2009 from .msi files. The instruction on this page works well on windows server 2003. It also works on other unsupported OS such as x64 windows XP and windows server 2008