Information Store databases do not mount and an event ID 9519 message with error 0xfffff764 is logged in Exchange 2000 Server and in Exchange Server 2003

The Microsoft Exchange Information Store service may start. However, one or more of the store databases may not mount successfully. The following error messages may be logged in the Application log:

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9519
Description:
Error 0xfffff764 starting database " Storage_group \Database" on the Microsoft Exchange Information Store.

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9518
Description:
Error 0xfffff764 starting Storage Group Distinguished_name_of_storage_group on the Microsoft Exchange Information Store.

Event Type: Error
Event Source: ESE98
Event Category: Logging/Recovery
Event ID: 454
Description:
Information Store (976) Database recovery/restore failed with unexpected error -2204

Additionally, you may receive the following error message:

This issue may occur if either of the following conditions is true:

• The streaming file (.stm) that is associated with the database has been deleted.
• Permissions for the streaming file (.stm) that is associated with the database have been modified. Therefore, Exchange cannot access the streaming file.

These conditions may occur when your antivirus program scans the Exchange 2000 Server or the Exchange Server 2003 folders.

To resolve this issue, restore the missing streaming file from a good backup to the Exchsrvr\Mdbdata folder. You can also see whether the antivirus software moved the streaming file to the Quarantine folder. If the streaming file is in the Quarantine folder, move the streaming file to the original location. Then, configure the antivirus program so that it does not scan the Exchange 2000 Server or Exchange Server 2003 folders.

Note Some antivirus programs change the file properties to Read-only when the files are moved to the Quarantine folder. If you find the streaming file in the Quarantine folder, right-click the file, and then click Properties. Click to clear the Read-only check box before you try to mount the database.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

The name of the streaming file corresponds to the name of the associated database file. However, the streaming file has a different file name extension. For example, the default mailbox store file name in Exchange 2000 Server is Priv1.edb. The matching streaming file for Priv1.edb is Priv1.stm. For more information about streaming files, click the following article number to view the article in the Microsoft Knowledge Base: