Requred help for sbs issue

Dear all,
Our company has three domains:

a.         abc.com
b.         xyz.in
c.         bcd.com

We have migrated xyz.in and bcd.com on Google Apps standard edition. abc.com is still on exchange server (SBS Server 2003).

Earlier Setup:
"      Who so ever marks a mail at test@xyz.in (inside or outside) it goes to Public Folder help@xyz.in, where users can access to emails from that public folder.

Current Setup:
"      Have migrated xyz domain to Google Apps and configured client machines through IMAP.

Problem:
Whenever user from LAN network sends a mail to help@xyz.in instead of going to Google Apps account it is going on local public folder( like before migration it was going) where as if someone from outside company sends an email to test@xyz.in, it is going appropriately to Google Apps and then directly to client machine.