All the posts I've read here and elsewhere regarding subdomains come to a similar conclusion, avoid using them because they are treated as a separate site -- and everything that goes along with that.
But on my site we have a subdomain on a separate server and it's treated as internal. Also this from Hubspot -
"**Use a subdomain of your website like Blog.HubSpot.com. **This is a great idea and this is what we do currently at HubSpot. Many companies have their blog on a subdomain, and it seems to be starting to be somewhat of a standard. The search engines are treating subdomains more and more as just portions of the main website, so the SEO value for your blog is going to add to your main website domain."
Any help clarifying this would be greatly appreciated!