Import calendar urgent help.

Hi all,

I used Outlook 2010 to export users mailbox to pst from Exchange 2003 and then import to our Exchange 2010 servers due to their large size

of mbx and I did not use Exmerge.  Now, all meetings with invite in a calendar folder become "copy" and users can not update.

But, other users I did with Exmerge has no such issue.

So, I am going to use Exmerge only calendar to pst and then import them to Exchange 2010.  Will new import delete all old copy calendar info?

Do I need to delete all calendar first?  If yes, is there a powershell to delete all info?

Thank you.