Monitoring event sink # 28 – Attachments Are Missing When You Use an Event Sink to Modify the Stream of Messages

One of my customer reported that they have a store event sink, which is used to modify the stream of incoming messages in Exchange Server environment (2003). But their attachments are missing when they open & view the message in Microsoft Outlook or in Microsoft Outlook Web Access (OWA); But contrarily when we view the message in Microsoft Outlook Express or by using Collaboration Data Objects (CDO), we can open and view the attachments in the message.

When we investigated regarding the issue, we found that this problem occurs because messages are incorrectly processed when we use a store event sink to modify the stream of messages in Exchange Server 2003 environment. There is an hotfix available for the above issue

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