Migrating Exchange 2007 to Office 365, Go-Daddy Hosted Website, How many SSL's do I need?

My setup is Windows 2008 server, with locally hosted Exchange 2007.  I'm trying to migrate to Office 365 Business Essentials on a cutover migration.  To do this, I've learned I need to enable Outlook Anywhere.  To do that I need an SSL.  Right now our email addresses are firstname.lastname@webdomain.org  Webdomain is registered through GoDaddy who also hosts our web site.  We have a MX record that directs our email to mail.webdomain.org and an A record for host mail that points to our static IP.  We currently have no SSL certificate anywhere that I can find.    I don't know how many SSL's I need, and I don't know how to make sure I'm requesting them correctly to make sure I'm covered for the migration.  I don't even know if I will need one for any longer than it takes to migrate to Office 365.  Can someone help point me in the right direction?
chadbaker72Asked:
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Seth SimmonsSr. Systems AdministratorCommented:
either get a wildcard cert or make sure all of the host names are part of the cert SAN
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R--RCommented:
You will require a single name third party SSL certificate to migrate Exchange 2007 to Office 365. then enable outlook anywhere using that url e.g mail.domain.com.

To create the CSR you can follow godaddy link as below.

https://in.godaddy.com/help/generating-a-certificate-signing-request-csr-exchange-server-2007-5281
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