Google Apps Migration Estimation failed Error

When i was migrating current POP mails to Google Apps IMAP, i got the Error. “Google Apps Migration Estimation failed Error “.

Please find one of My Work around.

Details of My Environment :

Microsoft Outlook POP Mails , migrating to Google Apps IMAP with Postini.

I tried with different solutions from the google Apps forums but didnt worked.

After running the Outlook migration tool

1) Enter the correct email Address and Password and click next

2) In the selection box Select and browse through the latest .PST file (if we are selecting the default its selecting all the .pst files which includes the archives and others , which will be a block of data, that caused me the Migration Estimation Error)

3) Select the files which you need to copy from that .PST file which selected in the above step.

4) it work for my case , Try the option if you found any other reason for the issue , kindly update here