Moving EV Enabled user mailbox from one company to another

Hi 

We want to Move 200 EV Enabled user mailboxes from another company to our company (we also using EV)

Now the plan is to Disable Archiving on OLD EV Server.

Export Archives to PST

Then create new mailboxes in our Exchnage Server

Import PSTs for EV archives into our EV

Then import PSTs for active Mailbox 

Now the question is Active mailbox will still have EV Shortcuts from old EV Servers.

How can we get rid of Shortcuts from their Exchange Mailbox programatically? So that when we import EV Archives (PST) it will create new shortcuts for imported PST and not have the old shortcuts pointing to invalid EV server?

Many Thanks in advance for your help!