Microsoft 365 for Nonprofits vs Slack for nonprofits

Choose Microsoft 365 for Nonprofits if…

Organisations whose staff, funders and partners rely on desktop Word, Excel and PowerPoint

Not ideal for: Tiny volunteer-led groups that need a simple setup with no IT help

Choose Slack if…

Teams of staff and volunteers who need quick day-to-day chat

Not ideal for: Organisations whose volunteers will not install another app

	Microsoft 365 for Nonprofits	Slack
Our rating	●●●●●	●●●●●
Price	Free for eligible nonprofits (Business Basic)	Free plan · paid from US$7.25/user/month
Nonprofit offer	Free Microsoft 365 Business Basic for up to 300 users and about 60-75% off other plans. The free Business Premium grant ended from 1 July 2025; Office 365 E1 grants now only apply in limited cases.	Slack Pro free for eligible nonprofit workspaces of 250 members or fewer, and 85% off for larger ones; eligibility is based on charitable status in your country.
Type	Suite	Specialist
Suits	Small, Medium, Large	Small, Medium, Large
Available in	🌍 Anywhere	🌍 Anywhere
Strengths	Best desktop Office apps and Excel for finance work Free Business Basic for up to 300 users Strong security and device management on Business Premium	Free Pro plan removes the main free-plan limitation Fast, familiar chat Large integration library
Watch out for	Free grant now excludes desktop apps (Business Basic is web and mobile only) Annual commitment and price changes on 1 July 2026 More complex to set up and manage than Google Workspace	Another app for volunteers to adopt Excluded organisation types (hospitals, schools, religious groups, grant-making foundations) Verification route is described differently by different sources (TechSoup vs Goodstack)
Key features	Outlook email at your own domain Teams chat, meetings and calling OneDrive and SharePoint file storage	Channels and direct messages Unlimited message history on Pro Huddles and calls

Our ratings: Microsoft 365 for Nonprofits: Free Business Basic and deep discounts make it the other default suite. Slack: The standard team chat, with Pro free for eligible nonprofits.

General information, not professional advice. Prices and nonprofit offers change and our research is AI-assisted, so confirm with the vendor before you buy. Names and logos belong to their owners. Full disclaimer

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