Article ID: 290215 - Last Review: February 27, 2007 - Revision: 3.2

Cannot mount mailbox or public store and event ID 491 occurs

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This article was previously published under Q290215

SYMPTOMS

When you try to mount the mailbox or public store, you may receive the following error message:

An internal processing error has occurred. Try restarting the Exchange System Manager or the Microsoft Exchange Information Store service, or both.

ID no: c1041724
Exchange System Manager

You may also receive the following error message when you click Logons or Mailboxes under Mailbox Store in Exchange System Manager:

MAPI or an unspecified service provider.
ID no: 00000476-0000-00000000

ID no: c1050476
Exchange System Manager

In addition, the following event ID messages may be logged in the Application event log:

Event Type: Error
Event Source: ESE98
Event Category: General
Event ID: 491
Date: 2/20/2001
Time: 1:54:22 PM
User: N/A
Computer: BREEZE
Description:
Information Store (2520) An attempt to determine the minimum I/O block size for the volume "E:\" containing "E:\Exchsrvr\Mdbdata\" failed with system error 5 (0x00000005): "Access is denied. ". The operation will fail with error -1032 (0xfffffbf8).

For more information, click http://search.support.microsoft.com/search/?adv=1.

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9518
Date: 2/20/2001
Time: 1:54:22 PM
User: N/A
Computer: BREEZE
Description:
Error 0xfffffbf8 starting Storage Group /DC=COM/DC=AIRSLIDE/CN=CONFIGURATION/CN=SERVICES/CN=MICROSOFT EXCHANGE/CN=AIRSLIDE/CN=ADMINISTRATIVE GROUPS/CN=FIRST ADMINISTRATIVE GROUP/CN=SERVERS/CN=BREEZE/CN=INFORMATIONSTORE/CN=FIRST STORAGE GROUP on the Microsoft Exchange Information Store.

For more information, click http://search.support.microsoft.com/search/?adv=1.

Event Type: Error
Event Source: MSExchangeSA
Event Category: MAPI Session
Event ID: 9175
Date: 2/20/2001
Time: 1:55:04 PM
User: N/A
Computer: BREEZE
Description:
The MAPI call 'OpenMsgStore' failed with the following error: The Microsoft Exchange Server computer is not available. Either there are network problems or the Microsoft Exchange Server computer is down for maintenance. The MAPI provider failed. Microsoft Exchange Server Information Store ID no: 8004011d-0526-00000000

For more information, click http://search.support.microsoft.com/search/?adv=1.

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CAUSE

This issue can occur if you do not have the appropriate permissions on the Mdbdata folder or to the drive that contains the Mdbdata folder to mount the mailbox or public store.

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RESOLUTION

To resolve this issue, grant the default permissions to the Mdbdata folder and to the root of the drive that contains the Mdbdata folder.

To grant the default permissions to the Mdbdata folder, follow these steps:

Start Windows Explorer, and then expand the Exchsrvr folder.
Right-click the Mdbdata folder, and then click Properties.
Click the Security tab, and then grant the following default 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, follow these steps:

Start Windows Explorer.
Right-click the local disk object that contains the Mdbdata folder, and then click Properties.
Click the Security tab, and then grant the following default permissions:
- Everyone: Full Control

To mount the affected mailbox or public store, start Exchange System Manager, right-click the mailbox or the public store, and then click Mount Store.

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