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What does the delivery failure say?
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I have ran into that before, it has to do with the time of the computer. Timezone must be correct, DST patch applied, i believe there is an outlook patch for this. On outlook if you go to Tools-&gt;Options-&gt;Calendar Options and Timezone... Verify everything is correct and run microsoft updates.
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I have ran into that before, it has to do with the time of the computer. Timezone must be correct, DST patch applied, i believe there is an outlook patch for this. On outlook if you go to Tools->Options->Calendar Options and Timezone... Verify everything is correct and run microsoft updates.

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Perfect. &nbsp;Just created a new profile for outlook and the problem went away.
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Perfect.  Just created a new profile for outlook and the problem went away.

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Great, I'm glad you are up &amp;&nbsp;running.
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One of our users is experiencing problems rescheduling meetings and notifying attendees outside of our company of the reschedule. &nbsp;The message that gets sent automatically informing the attendee of the new time never makes it to the recipient, though the initial meeting request and regular email goes just fine. &nbsp;The user first gets a delivery delayed message, followed by a delivery failed message. &nbsp;I and others are able to send out these meeting reschedule changes without a problem. &nbsp;I understand there is still a lot of troubleshooting left to do, but dont really know where to look from here. 
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One of our users is experiencing problems rescheduling meetings and notifying attendees outside of our company of the reschedule.  The message that gets sent automatically informing the attendee of the new time never makes it to the recipient, though the initial meeting request and regular email goes just fine.  The user first gets a delivery delayed message, followed by a delivery failed message.  I and others are able to send out these meeting reschedule changes without a problem.  I understand there is still a lot of troubleshooting left to do, but dont really know where to look from here. 

Outlook Meeting Reschedule messages fail to deliver to outside email addresses

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.

Exchange

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.