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if the server has two IP addresses and two domain names. &nbsp;One for the Apache website and one for the IIS website, I will need two certificates, correct? &nbsp;Thank you.
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if the server has two IP addresses and two domain names.  One for the Apache website and one for the IIS website, I will need two certificates, correct?  Thank you.

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Yes if it works. &nbsp;I'm not sure you can get them to listen to port 80 on separate IPs without conflict. &nbsp;But you might. &nbsp;See if you can get them to work without the SSL first.
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Yes if it works.  I'm not sure you can get them to listen to port 80 on separate IPs without conflict.  But you might.  See if you can get them to work without the SSL first.

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If I run IIS and Apache on same server, do I need two different SSL Certificates or can I use one for both?
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If I run IIS and Apache on same server, do I need two different SSL Certificates or can I use one for both?

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.

Web Servers

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.