How stop the automatical invitation.

Now, I use the eM Client to manage my personal account (@msn.com), and my company account.

When I receve the online meeting invitation,
I could successfully accept it, add it to my calendar (personal account).

But problem is that my personal account will automatically send the invitation again.
And than I am the host for the meeting.
Even, my company account will receive the new invitation, and remind me the time is not good.

I checked online information for outlook setting, or eM client, but so far, the problem is still continuing.

How can I stop it?