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Multiple fields are null (e.g. Message Id) in ExchangeMessageInfoCollection

weird issue at a customer:

Situation: Reading Mailbox messages from inbox via Exchange Web Services (Exchange 2016) in .NET
msgCollection = myClient.ListMessages(myClient.MailboxInfo.InboxUri);

Issue: As soon as there is a Meeting Response message in the inbox (Accept, Decline …), the properties “From” and “MessageId” for all elements of the ExchangeMessageInfoCollection are null.

Would there be any way to create a filter - so that these kind of messages are ignored?


Appointments/Meetings can be filtered from Exchange server. For details please visit the link:

Filter Appointments from Exchange Server

Furthermore you may forward us a sample problematic message. We will look into it and update you with our findings.

I think you have missed the point. I am using version and when I list the contents of the INBOX the “MessageID” and the “From” fields are not set.

I have jumped from version which did not have this issue.

I note that if I go to the trouble of actually loading the message I have access to these fields but that is not the point. It takes along time to download each message if I need this information.

When may this be fixed?


We are investigating this at our end and will update you here with our findings.


We were able to reproduce the issue and have logged it as EMAILNET-39041 for further investigation at our end. We’ll write back here once the issue is investigated and a fix version or some information is available in this regard.

The issues you have found earlier (filed as EMAILNET-39041) have been fixed in this update. This message was posted using BugNotificationTool from Downloads module by kashif.iqbal