Migration from Zimbra to Exchange 2010

We are currently running a Zimbra server and would like to migrate to Exchange 2010 SP1 Version: 14.01.0218.013.  This appears to be a very tedious process that requires either a manual PST import/export with Outlook (Not very effective with hundreds of mailboxes) or to use IMAPSYNC to move the mail.  I'm attempting to utilize IMAPSYNC since this can be scripted.

I use the command below:

 

imapsync --buffersize 819200 --syncinternaldates --host1 zimbra.server.com --port1 7143 --user1 USER --password1 PASSWORD \
 --host2 exchange.server.com --user2 USER --password2 PASSWORD --noauthmd5

 

As soon as the script executes the IMAP4 service on Exchange 2010 crashes.  The following is logged in the Event log

 

Event ID: 4999
Source: MSExchange Common

Watson report about to be sent for process id: 4304, with parameters: E12, c-RTL-AMD64, 14.01.0218.015, M.Exchange.Imap4, M.E.Data.Storage,
 M.E.D.S.InboundConversionOptions.CheckImceaDomain, System.ArgumentException, a59e, 14.01.0218.012.
ErrorReportingEnabled: False

I've tried POP2IMAP also and the same 4999 error is reported in the Event Log when it executes.  It appears to be anything that attempts to use IMAP.  Any ideas what could be causing the IMAP service to crash?

 

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Dmox