All, I watched my customer load the 5.1.5.0 client over a 5.1.1 on a Dell 2550 W2K SP2 system. He performed a reboot as requested by the installer and when the system tried to IPL it crashed with a Blue Screen of Death:
*** STOP: 0x000007B (0x85DCC1B0,0xC0000102,0x00000000,0x00000000) INACCESSIBLE_BOOT_DEVICE But this blue screen occurs after it finds the boot device and starts to initialize Windows. Applications: Exchange 2000 SP2 and AntiGen AntiVirus for Exchange. -- Joshua S. Bassi IBM Certified - AIX 4/5L, SAN, Shark Tivoli Certified Consultant - ADSM/TSM eServer Systems Expert -pSeries HACMP AIX, HACMP, Storage, TSM Consultant Cell (831) 595-3962 [EMAIL PROTECTED]