I have several very large mailboxes on Exchange 2003 that I need to move to Exchange 2010, most of them are static but one is actively written to. The largest one is 183 GB and has just over 2,500,000 items. I have never moved such large mailboxes. I have the following questions:
1. Is Exchange going to be able to move such large mailboxes?
2. Will there be significant performance issues when this process runs on the overall environment?
3. Any sort of guesstimate on the time it would take (I know there are many factors here but is it hours/days, etc)?
4. I have one mailbox which is over 70 GB and has about 700,000 items in it, there is currently a journaling rule on Exchange 2010 that utilizes that mailbox, which itself is sitting on Exchange 2003. If I move that mailbox, will there be issues journaling while the mailbox is being moved?