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This is a known issue between Exchange 2003 and Exchange 2007.<br />
<br />
The fix: <br />
<a href="http://support.microsoft.com/kb/938650" rel="ugc nofollow">http://support.microsoft.com/kb/938650</a><br />

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This is a known issue between Exchange 2003 and Exchange 2007.

The fix:
http://support.microsoft.com/kb/938650 [http://support.microsoft.com/kb/938650]


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So you don't miss it in the article like I first did. &nbsp; &nbsp;You need to install the hotfix and then mod the registry:<br />
<br />
Hotfix request (very top of the article): <br />
<a href="http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=938650&kbln=en-us" rel="ugc">http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=938650&kbln=en-us</a><br />

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So you don't miss it in the article like I first did.    You need to install the hotfix and then mod the registry:

Hotfix request (very top of the article):
http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=938650&kbln=en-us [http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=938650&kbln=en-us]


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Thanks.... I actually found that hotfix and applied it a couple weeks ago but this seems to happen for ALL external users, not just E2k7.
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Thanks.... I actually found that hotfix and applied it a couple weeks ago but this seems to happen for ALL external users, not just E2k7.

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Oops, previous comment was me on my other account...
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Oops, previous comment was me on my other account...

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You applied the hotfix and modified the registry and rebooted?<br />
<br />
So far I have done this about six or so times...actually one last night and have to check the results today. &nbsp; But they are all successfully in resolving. &nbsp; <br />

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You applied the hotfix and modified the registry and rebooted?

So far I have done this about six or so times...actually one last night and have to check the results today.   But they are all successfully in resolving.  


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<div class="content wysiwyg-content">
Having an issue where sending out updates to calendar entries to external users results in delivery status notification delay/failure messages.<br />
<br />
The initial calendar invite will go out fine, but if you go to edit it and send an update, that is when you receive the DSN message.<br />
<br />
Exchange is 2003SP2 running on Win2k3<br />
End users are using outlook 2007
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Having an issue where sending out updates to calendar entries to external users results in delivery status notification delay/failure messages.

The initial calendar invite will go out fine, but if you go to edit it and send an update, that is when you receive the DSN message.

Exchange is 2003SP2 running on Win2k3
End users are using outlook 2007

Receiving Delivery Status Notification when sending updated calendar entries

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.