Possible Resolution: Try sending the invitation using Windows Messenger. If this doesn't work, it may be because both your ...

 Possible Resolution: Try sending the invitation using Windows Messenger. If this doesn't work, it may be because both your and your assistant's computers are set to "On with no exceptions" mode. All connection methods, including e-mail and Windows Messenger, should work when your Windows Firewall is not set to "On with no exceptions" mode. 
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