We are migrating from Exchang 2003 to 2010. We've finished moving all mailboxes and are routing through 2010 - so just about finished. In the Application Logs on the Exchange 2010 server, we are seeing the error below. I do see the SystemMailbox{76d84c65-b2ae-4a34-a349-ede2c4b6ea2e} object in AD under Microsoft Exchange System Objects OU. Do I need this? Does anyone know what's causing this and how to fix it? Thanks.
The mailbox GUID of an external system mailbox ('Mailbox - SystemMailbox{76d84c65-b2ae-4a34-a349-ede2c4b6ea2e}') does not match the information in the Active Directory for the mailbox. The existing GUID ('d109aef7-a782-4f93-8710-7b9c89fbb585: /o=domain/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=SystemMailbox{76d84c65-b2ae-4a34-a349-ede2c4b6ea2e}') has been replaced with the expected GUID ('60529b2f-23d7-4611-995f-b8f9e8bde50d: /o=domain/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=SystemMailbox{76d84c65-b2ae-4a34-a349-ede2c4b6ea2e}').