If your using the calendar and itxxx8217;s Outlook based the dates when creating a meeting are the day you do it in and the time is usually about 1 hour advanced. Try an experiment and send one to one of your contacts and put the date out 2 or 3 days. Make sure you have the correct time.
The other thing to check is the xxx8220;Send Usingxxx8221; option. If you donxxx8217;t have it correct it wont send to the people using the same application they have. On a BES mine is set to xxx8220;desktopxxx8221; but I can set it to the other email addresses I Have. Doing this will in my case not send and load to a company contact.
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Z10 on BES
Z10 on BIS