While Microsoft in general has treated nonprofits well, with Office 365 they've taken it to the next level. An organization can setup a trial account and go through a process for Microsoft to verify that the non-profit is indeed a valid 501(c)(3) organization. Once the process is confirmed, Microsoft donates certain tiers of access.
For SCAR of MS, this means that they are now able to get E1 tier services donated directly by Microsoft. These Office 365 services are built directly off of Microsoft's Enterprise products that nonprofit organizations may already be using. Advanced features may still be purchased at steeply discounted rates and seamlessly integrated on a per-user basis alongside the donated users.
I'll be following SCAR's progress and posting lessons learned as they mature with these digital capabilities.