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Joe Lowe

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Certificate Question Migrating Exchange 2007 to 2013

I am about to undergo a migration from Exchange 2007 to 2013 and I am seeing in the Deployment Assistant and Microsoft's step-by-step article that it seems like I am supposed to request a new certificate from my CA.
I thought that somewhere I would have to export my SSL certificate and any others from my 2007 Exchange and import them onto my new 2013 server. Is that not true?

Please advise and if there are any articles I'd be interested in reading those too.
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I did see the legacy.domain.com steps and figured it was just for the coexistence. I don't necessarily need that and have prepared users for downtime so a complete cutover was my plan. So since it was, I can just export and import all certificates from Exchange 2007 to 2013? Or just the 1 SSL?

I guess another question I have as it was not in any of the instructions but Microsoft advised I do this..before I do the migration of the user mailboxes, I should dismount the database before the migration process correct?
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Okay great. Thank you for the advise. Last question I believe. I found this site to export the certificates from 2007: http://msexchangeguru.com/2013/06/29/import-cert-e2013/

However when I do the command 'Get-ExchangeCertificate' I see 5 Thumbprints of certificates. How do I know which ones to export exactly? So far I followed the steps in the link I provided on all the certificates that are still valid. Should that be suffice?