Exchange 2010

Can Exchange 2010 be installed when Exchange 2003 is still the current mail environment? If so can I set the CAS external domain to be the same as exchange 2003 (mail.companyname.com)
wmccann09Asked:
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Benjamin MOREAUConnect With a Mentor Project ManagerCommented:
Yes you can.

Read this technet article about this configuration : http://technet.microsoft.com/en-us/library/dd638130.aspx
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Deepu ChowdaryConnect With a Mentor Commented:
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wmccann09Author Commented:
If I select my current exchange 2003 server in the Mail flow section of Exchange 2010 setup will my current Exchange 2003 environment break?
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Benjamin MOREAUConnect With a Mentor Project ManagerCommented:
No; but after, you have to change your flow to Exchange 2010. Read the link of Exchange9 (http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/) to understand how it works
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wmccann09Author Commented:
Can I have this mail flow setup for a day or two before changing the flow to Exchange 2010?
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Benjamin MOREAUConnect With a Mentor Project ManagerCommented:
Yes, you can.
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