I mailed my OCI application to Chicago consulate on 19-Jan-2007 via priority mail and my application was acknowledged today 15-Mar-2007. In few threads I have seen questions like the online Reg No starts with USACI*****07. Actually the online generated Reg No is definetely like USACI*****07, but the File or Acknowledgement no is in the format of USAC00******, this is the first row of online enquiry status details.
OCI App mailed : 19-JAN-2007
Acknowledged : 15-MAR-2007
OCI App mailed : 19-JAN-2007
Acknowledged : 15-MAR-2007