Outlook 2007 Error sharing Calendar: Error while preparing to send sharing message

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James K

New Member
Outlook version
Outlook 2007
Email Account
Exchange Server
This is the error a user is having when they attempt to share a calendar "Outlook 2007 Error sharing Calendar: Error while preparing to send sharing message"

So far I recommend these steps

Right click on calendar > properties > Permissions and add the user if it is not there and also check any duplicates. If duplicates exists delete them.

This however did not correct the issue so can anyone suggest a fix or a link that fixes this issue with this 2007 or do you think an upgrade to 2010 would correct the issue.


New Member
Outlook version
Outlook 2013 64 bit
Email Account
Exchange Server 2013
Some time i have facing like this problem. From Diane i have got the best response. Thanks for sharing this and this will help me a lot in future too.
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