XADM: Mailbox Manager Error Message: Extension 'MBClean99' Could Not Be Loaded (298386)

SYMPTOMS

If you try to use the Microsoft Exchange Server Administrator program to administer a site after you used the Administrator program to delete either of the following extensions (depending on the server hardware platforms for the site), you may receive an error message:

Extension for Microsoft Exchange Mailbox Manager for i386
Extension for Microsoft Exchange Mailbox Manager for Alpha
Both of the preceding extensions.

The error message that you may receive is:

Extension 'MBClean99' could not be loaded. The extension for Microsoft Exchange Administrator's CPU type has not been installed in the site. Microsoft Exchange Administrator ID no: c1031667

If you click Ignore on the error message, the Mailbox Manager properties are open; however, the tabs that are displayed in the properties are the tabs that are usually displayed in the mailbox properties (for example, General, Distribution Lists, E-mail Addresses, and so on), instead of the Mailbox Manager properties tabs (for example, General, Policies, Schedule, Notification, and so on).

CAUSE

This issue can occur if the extensions for the administrator's central processing unit (CPU) type, either i386 or Alpha, are not available. More specifically, this issue can occur if you used the Administrator program to delete either the i386 extension, Alpha extension, or both from the Add-Ins container. This issue can also occur if the Administrator program is focused on a site that does not have Mailbox Manager installed, but you are trying to access the Mailbox Manager properties in another site.

RESOLUTION

To resolve this issue if the Extensions for Mailbox Manager are missing, run Mailbox Manager Setup on a server in the site that does not currently have Mailbox Manager installed or remove and reinstall Mailbox Manager on a computer that is currently running Mailbox Manager in the site.

WARNING: If you remove Mailbox Manager from a server that is currently running Mailbox Manager, when you try to reinstall the component, all settings are lost including excluded mailboxes, excluded message classes, custom notifications, and so on.

WORKAROUND

To work around this issue if Mailbox Manager is not installed on any server in the site that the Administrator program is currently focused on, change the focus of the Administrator program to focus on a site that has Mailbox Manager installed.