Removing exchange 2003 organization from 2003 Domain

Hello,
My company has fully migrated to Office365 (NOT Hybrid environment) from a local environment consisting of a single domain with a single exchange 2003 server.
Now I will be upgrading the domain to 2012, but I plan on removing the 2003 exchange organization first, before I upgrade domain to 2012.
Would this be the best approach?  Will this remove any needed the exchange attributes?
Thank you

Hi Robert,
After the migration is complete and you can retire your Exchange 2003, there are no any exchange attributes will be affected.
You can refer to the above link to remove the Exchange 2003 server from your organization.
Best regards,
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Niko Cheng
TechNet Community Support

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