Outside recipient not receiving meeting updates or cancelation

When organizing meeting with outside recipient they receive the invite but when we cancel or update the meeting they message gets delay and finally fails to be delivered.
Akbarzadeh_sAsked:
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dmessmanCommented:
I contacted Microsoft about this issue when I had the same issue.

In my case - it was when my Exchange 2003 box was working with Exchange 2007 boxes.  So it would happen for some external recipients but not all.

Check this page for details on the fix:
http://support.microsoft.com/kb/938650
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Akbarzadeh_sAuthor Commented:
Thank you.
I will implement this on our exchange backend servers and let you know this month.
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Akbarzadeh_sAuthor Commented:
Thank You
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