Windows Server 2025 in Production: What's Actually Worth Upgrading For
A year in, Windows Server 2025 has settled down. Here's what's genuinely useful for Saint Louis SMBs and what to still be careful with.
Windows Server 2025 has been generally available for over a year now, and the early rollout hiccups are mostly behind us. If you're still on 2019 (or, heaven help you, 2016), it's a real upgrade — but not for the marketing-brochure reasons. Here's what actually matters in the SMB environments we run.
The genuinely useful features
- Hotpatching for Server. No more reboots for most monthly security patches when you're licensed through Azure Arc. For a 6-node Hyper-V cluster running around the clock, this is a real change in maintenance windows.
- Active Directory gets a real refresh. 32K-page database format, better LDAP defaults, and improved Kerberos armoring. If you've been putting off promoting new domain controllers, this is the release to do it on.
- Hyper-V improvements. GPU partitioning for virtual desktops, better live migration performance, and a saner default networking stack. Storage Replica and S2D got real bug fixes too.
- SMB over QUIC and hardened defaults. SMB signing is on by default. NTLM is finally deprecated in ways you'll feel. Plan for it.
What we still tell clients to be careful with
- In-place upgrades from 2016 or 2019. They work more often than they used to, but we still prefer clean installs for domain controllers and anything running SQL Server.
- Third-party backup and EDR compatibility. Check your vendor's compatibility matrix before you upgrade production. A year in, coverage is solid — but not universal.
- NTLM deprecation. Old line-of-business apps and MFPs still lean on it. Audit before you disable, or you'll break scan-to-folder on a hundred copiers on a Monday morning.
- Line-of-business software from vendors who move slowly. If your ERP vendor is still "certifying" Server 2019, you'll wait.
The migration path we recommend
For most Saint Louis SMBs on Server 2019 today: stand up new Server 2025 domain controllers side-by-side, transfer FSMO roles, decommission the old ones. Rebuild file and app servers cleanly rather than in-place. Do it before Server 2019's extended support drops off in early 2029 — sooner if you're chasing a cyber-insurance requirement.
Want a second set of eyes on your upgrade plan? We do this every week.