Exchange 2003 to 2010 transition

We recently transitioned from exchange 2003 to 2010 and All is well. My old exchange box has been turned off for a couple of weeks both boxes are virtual.
My questions
Are there any reasons why I cant just delete the old exchange server.
Any benefits to either way?
Thanks
ProperlotAsked:
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Alex GreenProject Systems EngineerCommented:
When you decomission the old box when you uninstall the application it cleans up your active directory and LDAP

http://technet.microsoft.com/en-us/library/bb125110%28v=exchg.65%29.aspx
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Simon Butler (Sembee)ConsultantCommented:
You need to remove Exchange correctly, rather than just deleting it.
If you don't then you will leave a lot of stuff behind in the AD. If you want to migrate to a later version of Exchange you will be unable to, because the Exchange 2003 server still exists.

Follow the steps to remove Exchange 2003 correctly, there are quite a few bits to do:
http://technet.microsoft.com/en-us/library/gg576862(v=exchg.141).aspx

It needs to include removing the server using add/remove programs.

Benefits? One makes you supported, one doesn't.

Simon.
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