I currently have an Exchange 2007 server that is running extremely slow, and I'm looking into setting up a new Exchange 2013 server on better hardware.
Currently, a move of a mailbox on the 2007 server can take 12+ hours for a 500 meg mailbox. As such, I'm thinking I may not want to move mailboxes from 2007 to 2013 (perhaps move some, but not all). However, I'd like to have an easy way to create all the accounts on the new server, then perhaps export from the .ost file to a .pst, and import this data into the new server.
I haven't done an Exchange upgrade before, so I'm wondering if something like this is possible, perhaps with Powershell? (My main goal is to avoid moving mailboxes for fear of long duration, but also try and get up as quickly as possible.)