Cause:
Exchange.

Fix:

Edit the boot.ini (note the change below after fastdetect) Thats all on one line if it gets wrapped!!

Example

BEFORE

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Windows Server 2003, Standard" /fastdetect
C:\CMDCONS\BOOTSECT.DAT="Microsoft Windows Recovery Console" /cmdcons

AFTER

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Windows Server 2003, Standard" /fastdetect /3GB /USERVA=3030
C:\CMDCONS\BOOTSECT.DAT="Microsoft

OR

If you want to turn off the memory configuration check, you can create the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
Parameter: Suppress Memory Configuration Notification
Type: REG_DWORD
Setting: 1

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