| Event Id | 8503 |
| Source | MSExchangeIS Mailbox Store |
| Description | Unable to move mailbox <mailbox name>. A problem occurred while opening an attached message. Parent folder name: <folder name>, parent message subject: <subject>; Error code: <error code>. Run ISINTEG to check for any problem in the database "<name>". |
| Event Information | Stop the Information Store service. Check the security permissions and access control lists (ACLs) security descriptions on the mailbox.
Contact Microsoft Product Support Services for assistance running the Isinteg utility to check and repair any private or public information store database inconsistencies that may have occurred. |
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