new account. joining existing domain

I am setting up office 365 so that we can share documents with everyone in our organization.  We already host an exchange server in the cloud.  I would like to setup our current domain with office 365.  

During the setup process they ask to add a test MX record for verification, but I already have and MX record pointing to an exchange server.  I don't want this "test" to affect the current MX record.  

Am I okay in setting up the test?  Once the domain is attached, will there be two exchanges?
al4629740Asked:
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Gareth GudgerConnect With a Mentor Commented:
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
You can have multiple MX records pointing to a single Exchange environment. This is where you setup and configure Authoritative accepted domains. You can then configure email address policies for users that have different email domains that are associated with Accepted Domains that you configure in your environment.

Understanding Accepted Domains - http://technet.microsoft.com/en-us/library/bb124423(v=exchg.150).aspx

That being said you can have multiple MX records pointing to a single Exchange server.

Will.
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Gareth GudgerConnect With a Mentor Commented:
You can do the domain verification process with a TXT record instead. It is completely non-intrusive. See the article here. This is the process I used my last 3 Office365 customer migrations.

http://technet.microsoft.com/en-us/library/hh852557.aspx
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