Decommissioning Exchange 2003 after Office 365 Migration

Hello,
My company recently migrated from Exchange 2003 to Office 365 and are working on decommissioning our on-premises Exchange 2003 server. We believe everything is ready to go, however this Microsoft article: http://help.outlook.com/en-us/140/ff959224.aspx#nextsteps has
a big Caution box warning of "unintended consequences" and recommending I contact Microsoft Support:
I've tried my Office 365 support options, but they only tell me that Exchange 2003 is no longer supported and they can't help me, despite the fact that I'm trying to remove it, not maintain it. So
I'm allowed to pay for a new service, but shouldn't expect assistance in safely moving from my old service...
Regardless, they directed me here, so I was hoping someone might be able to advise about what these "unintended consequences" actually are so I can feel fully prepared to decommission.
Thanks in Advance,
Jim

Hi,
After you’ve verified that all e-mail is being routed directly to the cloud-based mailboxes, completed the migration, and no longer need to maintain your on-premises e-mail organization or don’t plan on implementing a single sign-on solution, you can uninstall
Exchange from your servers and remove your on-premises Exchange organization. For more information, see the following:
How to Uninstall Exchange Server 2003
http://technet.microsoft.com/en-us/library/bb125110(EXCHG.65).aspx
Best regards,
Belinda
Belinda Ma
TechNet Community Support

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Decommissioning Exchange 2003 after Office 365 Migration

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