Is Nextcloud a realistic Microsoft 365 replacement in 2026?
Hey everyone,
I’m part of an internal working group at a healthcare provider with around 9,000 employees (roughly 500 of them in non-medical administration), and we’re currently having some pretty serious discussions about whether we could replace Microsoft 365 entirely with Nextcloud.
More specifically, we’re looking at:
Nextcloud Talk instead of Teams
Collabora or OnlyOffice instead of Word/Excel/PowerPoint
possibly Nextcloud Mail for internal communication instead of Outlook/Exchange
The main driver is honestly cost. The M365 licenses alone for our administrative staff add up to a significant amount every year. On top of that, GDPR and general data protection concerns are a major factor — especially in healthcare, where US-based cloud services tend to be viewed much more critically.
I’d really be interested to hear if anyone here has gone through a similar transition and could share some real-world experience.
Especially:
Has anyone actually replaced M365 completely with Nextcloud? How did it go?
Is Nextcloud Talk realistically usable as a day-to-day Teams replacement, or do you run into limitations quickly?
How well do Collabora or OnlyOffice work as substitutes for Word/Excel in practice? Where are the real pain points?
How did you handle user adoption? Telling people “we’re taking away Teams and Outlook” usually doesn’t go over particularly well 😅
Are there any healthcare-specific pitfalls we should be aware of? For example integrations with clinical systems, scheduling/on-call tools, and similar things?
We’re still very much in the early discussion phase, so honest opinions — including “don’t do it” experiences — are absolutely welcome.
Thanks in advance!