Exchange Power Shell Scripts

move-mailbox user -targetdatabase server\sg\db
disable-mailbox user
enable-mailbox user

enable-mailbox cmdlet (2010 link but same as 2007)
http://technet.microsoft.com/en-us/library/aa998251.aspx

1. move-mailbox UserName -database SourceDatabase -TargetDatabase TargetDatabase

2. disable-mailbox username

3. when you say connect you mean create a new mailbox ?
enable-mailbox username -database DatabaseName

What I'm saying is for example a user moves from Chicago to Cleveland, the user will still be with the same company and he also wants to keep his old email. However, he will not be on the same Exchange Server\Database, and Cleveland has a different login username than Chicago. What PowerShell Scripts would I use to disconnect the user from his mailbox in Chicago, move the mail to Cleveland, and then reconnect him to the mail in Cleveland with his new username?

if it is still the same user there is no reason why his username will change from one site to another.

In all cases you cannot "move" a disconnected mailbox

this will disable the mailbox from the current account
disable-mailbox chicago

then you reconnect
Connect-Mailbox -Identity chicago -Database "Mailbox Database" -User cleveland
http://technet.microsoft.com/en-us/library/bb201701(EXCHG.80).aspx

however the issue you have there is the mailbox still resides in chicago
you would then want to run the move-mailbox cmdlet

The organization that I work with changes the username to match the location that the user is at. If not move, can it be copied from one location to another and then deleted?

i would just rename the useraccount and move the mailbox

since they are on the same server just different databases it would be

move-mailbox olduser -database newdb
disable-mailbox olduser
connect-mailbox olduser -user newuser

however, if my memory serves me right, you cannot connect the mailbox of a user to another user as long as the original user exists so you should replace the disable-mailbox by remove-mailbox which will delete the account from AD

"i would just rename the useraccount and move the mailbox"

seconded !

Renaming the user account will work if they are located in the same Domain, but what would I need to do if they were not.

then you need to create the new account, disable the current mailbox, and connect the new account to the mailbox, move the mailbox

commands given earlier

good call, forgot about that tool