According to speakers at the Microsoft Enterprise Conference (MEC) 2001 in Orlando, Florida (September 2001), memory fragmentation is the main reason Microsoft Exchange 2000 Server doesn't take full advantage of Windows 2000 clustering. Microsoft is trying to fix the memory-fragmentation problems, but in the interim, anyone interested in clustering Exchange servers needs to consider all alternatives before making a final decision. For more details about memory fragmentation and Exchange clustering, read "Memory Fragmentation and Exchange Clusters" at the following URL: