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Message: [QUOTE="K. Orland, post: 4677692"] The error "0x80004005-0x0004b9-0x000501" comes from trying to submit a message on the Exchange transport. The code 0x0004b9 is an ecNullObject from Store, indicating that the failure occurred because an object referenced was null. This implies that this user was having some intermittent networking issue that happened to hit at the time the message was submitted. This behavior is by design and the error is expected when network failures occur. If the computer is connected via wireless or a WAN link, then random failures on the network can be common, and that would explain the behavior. Even on a local area network, RPC failures are not uncommon. In general, this problem is likely caused by intermittent network connectivity issues, or possibly out-of-resource problem on the client machine. I suggest you check your network environment to see if there is something abnormal. [/QUOTE]