Duplicate entries within the outlook calendar

[nhat]

hi
i have problem with the Calendar when i send a meeting request to they send a request to calendar event before i accept the request, however when i accept the request it send another same request to calendar. which mean there are double entries in the calendar.
i saw a tip on Technet is to untick the Automatic accept and cancelation within Schedule Resourcing. But the problem remain the same.

Can any one help me please

Thank in
Advance

 

[nhat]

helo

i already found that caused by Backberry you need update from them