I recently installed a new 2008 r2 server into an existing 2003 environment. I Have an existing exchange 2003 system running. I loaded exchange 2010 on the new server using the typical install and setting up the options for it to coexist with the 2003 exchange server. Everything seem to go fine until the mailbox roll where it errored out. I inadvertently close the error message box before copying the errors. While in the control panel I found that you could load roles through the change option, so I loaded the mailbox roll. It loaded quickly and with no error messages. After this I was able to see the mailboxes from the new server.
I am not convinced that this was the correct procedure and would like to remove exchange 2010 and run the install again. So my question is at this time can I use add/remove programs and unload the exchange 2010 server without any detrimental effects the the existing enviroment and the existing exchange server? I have not moved anything from the exchange 2003 server to the exchange 2010 server, I have only installed 2010.