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So, I have set up my Exchange 2013 CAS server which is to be used as my Office 365 Hybrid server for mailbox migrations. <br />
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My question is what all do I need to add to the SAN for this SSL Certificate? <br />
<br />
We accept mail for numerous mail domains (28 total) which only 15% of my users use a different primary SMTP address. Everyone has the one main SMTP and SIP address, just those 15% are manually updated to use a different Primary SMTP address. <br />
<br />
I know I need webmail.domainname.com, autodiscover.domainname.co<wbr />m, but do I need to have a SAN Certificate for ALL 28 domains or can I get away with using just the common (master) dominate that everyone has? <br />
<br />
All our mail flow is being directed thru EOP already thru connectors. <br />
<br />
Anyone got an Hybrid Server Certificates for Dummies advice for this non-expert?
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So, I have set up my Exchange 2013 CAS server which is to be used as my Office 365 Hybrid server for mailbox migrations. 

My question is what all do I need to add to the SAN for this SSL Certificate? 

We accept mail for numerous mail domains (28 total) which only 15% of my users use a different primary SMTP address. Everyone has the one main SMTP and SIP address, just those 15% are manually updated to use a different Primary SMTP address. 

I know I need webmail.domainname.com, autodiscover.domainname.com, but do I need to have a SAN Certificate for ALL 28 domains or can I get away with using just the common (master) dominate that everyone has? 

All our mail flow is being directed thru EOP already thru connectors. 

Anyone got an Hybrid Server Certificates for Dummies advice for this non-expert?

CERTIFICATES - Hybrid Exchange 2013 - Office 365 Migration

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.