Event ID - 9667

Event Id9667
DescriptionError 80040305-80000000 occurred while processing message <> from Username.
Event InformationAccording to Microsoft:
This problem may occur if the information store on your Exchange server receives e-mail messages that contain deep-nested delivery status notification messages.
Download the hotfix from Microsoft,after you apply this hotfix, you must add the LimitEmbeddingDepth registry subkey on the server to resolve the problem. To do this, follow these steps.
Warning:Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then right-click the following registry subkey:
3. Click New, and then click DWORD Value.
4. In the New Value #1 box, type LimitEmbeddingDepth, and then press ENTER.
5. In the right pane, click LimitEmbeddingDepth, click Edit, and then click Modify.
6. In the Value Data box, type an appropriate amount between 1 and 99 for your environment. Note that 100 is both the default value and the maximum value.
7. Under Base, click Decimal, and then click OK.
8. Quit Registry Editor.
Reference LinksThe Microsoft Exchange Information Store service uses 100 percent of the CPU resources on an Exchange 2000 server

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