Event ID - 12003

Event Id12003
SourceMSExchangeIS
DescriptionError 80070003-82000387 occurred while processing message 5.169.5.0.0.13459.988140029@sender11.domain.com with subject test.Error 80070003-82000387 occurred while processing message 5.169.5.0.0.13459.988140029@sender11.domain.com with subject 'test'.

Error {error code} occurred while processing message {message id} with subject '{subject}' from '{host name}'.
Event InformationAccording to Microsoft :
Cause :
This problem may occur if you move the Exchange Server information store database files to another folder on the Exchange Server computer, and then delete the old folder in which those files were stored.
For example, if you install Exchange Server in the default installation folder (C:\Program Files\Exchsrvr), the database files are stored in the C:\Program Files\Exchsrvr\Mdbdata folder by default. If you move the database and log files to the E:\Program Files\Exchsrvr\Mdbdata folder, and then delete the C:\Program Files\Exchsrvr\Mdbdata folder, you may experience the behaviors described in the "Symptoms" section.
This problem occurs because the information about the folder in which the Exchange Server database and log files are stored is written to the Windows registry in the following location (where C:\Program Files\Exchsrvr\Mdbdata is the folder in which the database and log files are stored):
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
Value name: Working Directory
Value type:REG_SZ
Value data:C:\Program Files\Exchsrvr\Mdbdata
The message conversion process uses the Working Directory parameter as its temporary directory during the conversion process. If the folder structure is missing, or if the registry entry points to location that is not correct, the conversion process is not successful.
Resolution :
To resolve this problem, use one of the following methods:
Method 1: Re-create the Deleted Folder Structure
Method 1: Re-create the Deleted Folder Structure.
Method 2: Edit the Registry to Point to the New Folder Structure
Edit the Windows registry to specify the new location of the Exchange Server database and log files. To do so, follow these steps.
Note:
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.
1.ClickStart, click Run, typeregedit in theOpen box, and then clickOK.
2.Locate the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
3.In the right pane of Registry Editor, double-clickWorking Directory.
4.Edit the path in theValue data box to point to the new location of the Exchange Server database and log files, and then clickOK.
5.Quit Registry Editor.
Reference LinksEvent ID 12003 from Source MSExchangeIS

Messages That Have Attachments Are Not Delivered as Expected and Event ID 12003 and 327 Messages Are Logged

Messages That Have Attachments Are Not Delivered as Expected and Event ID 12003 and 327 Messages Are Logged

Message Body Missing or Truncated While Downloading Msg

How to Move Exchange Databases and Logs in Exchange 2000 Server

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