Event ID - 1503

Event Id1503
DescriptionAn unknown error occurred while processing the current request: Exception of type System.OutOfMemoryException was thrown.
Event InformationAccording To Microsoft:"
This problem may occur if Exchange Server 2003 is running on a Microsoft Windows 2000-based computer. In this scenario, virtual memory fragmentation may occur if Exchange Server 2003 is under a heavy load. You may experience this problem during stress-testing of your Exchange Server environment.

1. Obtain and install the hotfix that is described in the following Microsoft Knowledge Base article:
820745 (http://support.microsoft.com/kb/820745/) Failfast occurs when you experience an "out of memory" condition

2. Configure the following registry entry with a value of 1:

Value name: GCFailFastOnOOM
Value type: REG_DWORD
Value data: 1

After you configure this registry entry, if you experience an out-of-memory condition on your Exchange Server computer, an event that contains the following description is logged:
Failed to allocate numberOfbytes bytes with numberOfbytes bytes in use and numberOfbytes free bytes. Process will be Terminated

However, in this scenario, a new process is automatically started on the next user request. No administrative action is required.
Reference LinksOutlook Mobile Access users cannot access their mailboxes on a heavily-loaded Exchange Server 2003 computer

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