This error indicates that the folder or drive that hosts the Exchange database files does not have the permissions assigned that are required to perform minimum functions. You may experience difficulties in accessing or mounting the mailbox stores or public folder stores.

To resolve the issue, grant the default permissions to the folder that contains the Exchange databases and to the drive on which this folder resides.

To grant the default permissions to the folder that contains the Exchange databases in Exchange 2007

1. Start Windows Explorer, and then navigate to the folder that contains the Exchange databases. By default this is C:\Program Files\Microsoft\Exchange\Mailbox\Storage Group Name\

2. Right-click that folder and then click Properties.

3. Click the Security tab, and then grant the following default permissions

Account	Permissions
Administrators	Full Control
System	Full Control

To grant the default permissions to the drive that contains the Exchange databases in Exchange 2007

1. Start Windows Explorer.

2. Right-click the Local Disk object that contains the Exchange database folder, and then click Properties.

3. Select the Security tab, and then grant the following default permissions, depending on the operating system installed:

For Windows 2000 Server:

Account	Permissions
Everyone	Full Control

For Windows Server 2003:

Account	Permissions
Administrators	Full Control
Creator Owner	None
Everyone	None
System	Full Control
Users	Read and Execute, List Folder Contents, Read

To grant the default permissions to the Mdbdata folder Exchange 2000 Server and Exchange Server 2003

1. Start Windows Explorer, and then navigate to and expand the Exchsvr folder.

2. Right-click the Mdbdata folder, and then click Properties

3. Click the Security tab, and then grant the following default permissions:

Account	Permissions
Administrators	Full Control
Authenticated Users	Read and Execute, List Folder Contents, Read
Creator Owner	None
Server Operators	Modify, Read and Execute, List Folder Contents, Read, Write
System	Full Control

To grant the default permissions to the drive that contains the Mdbdata folder in Exchange 2000 Server and Exchange Server 2003

1. Start Windows Explorer.

2. Right-click the Local Disk object that contains the Mdbdata folder, and then click Properties.

3. Select the Security tab, and then grant the following default permissions, depending on the operating system installed:

For Windows 2000 Server:

Account	Permissions
Everyone	Full Control

For Windows Server 2003:

Account	Permissions
Administrators	Full Control
Creator Owner	None
Everyone	None
System	Full Control
Users	Read and Execute, List Folder Contents, Read

For more information about this issue, see Microsoft Knowledge Base article 823022, "Event ID 490 is logged, and you receive the following error message when you try to mount the mailbox store or the public store in Exchange Server: "ID No: c1041724"" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=823022).