Windows network impact on Apple updates
About the Mac OS X 10.5.3 Update:
http://support.apple.com/kb/HT1141
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Improves Safari reliability when connecting to the Internet through a Microsoft ISA proxy.
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Improves Active Directory binding and login.
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Eliminates a delay when logging in as an Active Directory user in a .local domain.
Read the complete post at http://msmvps.com/blogs/bradley/archive/2008/05/28/windows-network-impact-on-apple-updates.aspx