Jeremy Kelly is reporting an unusual interaction between Entourage and Exchange 2003. The symptom: transaction log bloat. The problem seems to occur when an Entourage client tries to submit a message that's too large for the maximum message size limit set on that user's mailbox store. Instead of reporting the error (and not resubmitting the message), Entourage happily tries to send the message each time it connects. If the message is large enough, and if this goes on long enough, the server will eventually run out of log space. Jeremy recommends a temporary fix of turning off httpdav, removing the offending message from the client, and re-enabling httpdav; no word yet on an ETA for a better fix.