So apparently my request to have the issue promoted to the next level of support was denied, and once again, the answer is to tell the business owner (essentially) jump through hoops because a data issue can't be fixed.   Let me point out another frustration, the over-politeness that feels almost belittling; like they're talking to a 5 year old or something.   If you're 'truly sorry' then fix the problem!   If this was Ray Ozzie or some other CXO at Microsoft I'm sure this would've been fixed by now.

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Hello Brian, 

 Thank you for replying to us at Microsoft Office Live Workspace Support.

 My name is Akash XXXXX and I have updated Service Request # 1121112775, which was created to track your concern. 

 I am aware of your concern that you are unable to share with a particular email ID. Also, you would like to hear personally from the Next level team and the team above. I realize the importance of your concern and I would provide you with the information.

 Brian, I am sorry to inform you that, we will not be able to escalate the case further to Next level or the team above as we have received the update from our Next level team to tell you that the concern is with the particular email ID. Also, before providing you with the resolution we have done enough troubleshooting and tried to resolve the concern but found out that the problem is with the particular email ID.

 Additionally, as an alternative I would suggest you to use another email ID to share workspace with the user so that you do not face any problem while sharing.

 Once again, I truly apologize that we were not able to provide you with an experience that was completely satisfactory to you. While I realize that only our future interactions can restore your complete confidence in us, I want to assure you that your experience was unusual and is not indicative of the quality service Microsoft Office Live is capable of providing. Microsoft Office Live intention is to provide our customers with the best products and customer experience that is both satisfying and enjoyable.

 For your convenience, our support staff is available 24 hours a day, 7 days a week. If you have additional questions, concerns or need further assistance, please be sure not to change the subject line while replying to this email so that we can urgently address any remaining concerns.

 You may be selected to receive a survey. Your feedback is valuable to us as we are very interested in hearing about your support experience. Should you receive a survey, we appreciate you taking the time to respond.

Have a great day, Brian!    
  
Regards,

Akash XXXX
Microsoft Office Live Workspace Support