"Windows Server 2008": slow network speed with Macintosh computer

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After switching over to SBS 2008 (from SBS 2003) the network speed of my
PowerMac G5 (write to SMB share, OS X 10.5.5) dropped from 18 Mb/s to
1 Mb/s. The Read-speed is about 30 Mb/s, which is almost the same as the
SBS 2003 speed.
Vista workstations connect to the server with normal speeds.


Please help,

Fulco