Hi, It seem that Exchange 2007 can be install on a 2000 domain without problem. But there islimitation of doing this? Thanks a lot! R.L.

You can only host Exchange 2007 in Windows 2000 native - or Windows 2003 mode. Note: Each site containing Exchange 2007 does require at least oneWindows 2003 SP1 GC..... When running 2000 native you can not have forest-to-forest delegation and therefore also no free-busy scheduling accros forests. Cheers, Mark