When you log on to a computer that is running Microsoft Exchange Server 2003 and either Microsoft Windows Server 2000 or Microsoft Windows Server 2003, you may receive the following error message:

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This problem typically occurs when the /3GB switch or the /PAE switch is present in the Boot.ini file. When one of these switches is present, the computer may run out of available system page table entries.

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this issue, restart your computer in Safe Mode. To restart your computer in Safe Mode, press F8 when the computer starts. Then, when the computer is in Safe Mode, add the System Pages entry to the following registry subkey:To add this registry entry, follow these steps:

1.	Log on by using an account that has administrative credentials.
2.	Click Start, click Run, type regedit, and then click OK.
3.	In Registry Editor, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
4.	On the Edit menu, point to New, and then click DWORD value.
5.	Type SystemPages, and then press ENTER.
6.	On the Edit menu, click Modify.
7.	Click Decimal, type 31000, and then click OK.
8.	Quit Registry Editor.

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