setup SSL certificate

We have to migrate our on prem exchange server to office 365.  part of the process is that we have to setup an ssl certificate on the exchange server.  I have no idea how to do this.  Do I contact any web hoster and set it up with them.  How do I create an SSL cert?
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Vasil Michev (MVP)Commented:
Might help if you let us know what kind of migration you are planning to perform, what is the version of your Exchange server, etc. You will indeed need a publicly trusted certificate, but if you dont have one already you can get one for free from sites like StartSSL or Comodo. Once you have the cert, just search for "Configure Outlook Anywhere" on what the feature does and how to configure it. Here's an example article:

And here's how to configure a certificate:

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al4629740Author Commented:
Migrating from exchange 2007 to office 365
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