Exchange 2000 + 2007 in 2008 Domain!

Hi There!!

We've got on a testbed server, server 2008 as a DC (2003 functionality),

We have exchange 2000 running on a 2000 Server...

We then have exchange 2007 running on a 2003 server box,

We've installed exchange 2007 successfully and all is fine! but moving the existing mailboxes from the 2000 server to 2007 wont work...

The information store is down and wont start, all this is since installing exchange 2007,

Does anybody have any ideas? ;) Thanks in advance!!

Mart