Attendees invitation not sent
 

Hi,
when I create calendar event (does not matter where if in default calendar or pocket informant) and select attendees to the event from my contact list I cannot send the invitation via live account. Message will be in the outbox folder and that after sync it would say message could not be sent. I can open the message in outbox, but there is nothing in it just recipient. If at this point I do send the message it will be sent/delivered successfully, but without any event info, just plain message without subject and body or attachment. Does it work only with regular emails and not live accounts?
Thank you