430-4.2.0 STOREDRV;
mailbox logon failure 430 4.2.0
STOREDRV.Deliver.Exception:ConnectionFailedTransientException.MapiExceptionLogonFailed;
Failed to process message due to a transient exception with message
Cannot open mailbox /o=WTE/ou=Exchange Administrative Group
(FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=2K10EXCHANGE/cn=Microsoft System Attendant.
16.47655:4E010000, 17.64039:110104805E000000000000000000000000000000, 4.41073:11010480,
0.48243:FE000000, 4.50033:11010480, 255.1494:00000000, 0.64445:11010480,
4.60989:0F010480, 0.61373:0F010480, 0.24684:0F010480, 4.20076:11010480,
4.57713:11010480, 4.49009:11010480, 255.1750:0F010480, 4.52465:11010480,
0.60065:0F010480, 4.33777:11010480, 0.59805:00000000, 4.52209:11010480,
0.56583:320A0000, 4.52487:11010480, 0.19778:320A0000, 4.27970:11010480,
0.17730:320A0000, 4.25922:11010480 [Stage: CreateSession]

Reason

Store is dismounted