posted this on March 16, 2011 21:32
Some Exchange servers that have been in commission for years may hit MAPI named property limits. These limits are reached when we attempt to retrieve more properties than the server is configured for. You will know if your server reaches these limits as an event similar to the following is logged:
Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 9667 Date: 6/11/2010 Time: 4:56:13 PM User: N/A Computer: SERVERNAME Description: Failed to create a new named property for database "First Storage Group\Mailbox Store (SERVERNAME)" because the number of named properties reached the quota limit (8192). User attempting to create the named property: "SYSTEM" Named property GUID: 00062002-0000-0000-c000-000000000046 Named property name/id: "33377" For more information, click http://www.microsoft.com/contentredirect.asp.
To increase the number of MAPI named properties:
Start the Registry Editor on the mailbox server
Locate the registry key HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<ServerName>\<Private-GUID>
Set the following DWORD values or create new values if they do not exist
NonMAPI Named Props Quota == 00007fff
Named Props Quota == 00007fff
You may either wait approximately 30 minutes for these values to take effect automatically or reboot the server to take effect immediately.