Written and maintained by CASRAI Editorial Board
Last updated
If your institution already licenses Microsoft 365 E5 or A5, you almost certainly already have Microsoft Defender for Endpoint Plan 2 running on every managed Windows and Mac device — and paying separately for Bitdefender GravityZone on top of that license is, for many research offices, genuinely not worth it. The honest, short version: Microsoft Defender is the right call when your fleet is mostly managed, mostly Windows/Mac, and mostly already inside an E5/A5 agreement. GravityZone earns its separate line item mainly when your environment is messier than that — heterogeneous lab-equipment endpoints, older or embedded OSes attached to instruments, and a need for one console across all of it that Defender’s Microsoft-365-centric tooling doesn’t cover as cleanly.
This guide works through what you already get from Defender inside typical M365/E5 licensing, where GravityZone’s separate cost is actually earned, and the specific research-IT scenario — instrument PCs, legacy lab software, cross-platform core facilities — where the calculus flips.
What Microsoft Defender already gives you inside M365/E5 licensing
Microsoft’s own current plan pages (Microsoft Learn, checked 2026-08-26) confirm that Microsoft 365 E5 and the A5 education-tier equivalent bundle Defender for Endpoint Plan 2 — the tier with automated investigation and remediation, threat and vulnerability management, and attack-surface reduction, not just the baseline antivirus in Plan 1. If your institution is already paying for E5/A5 seats for the mail/Teams/Office stack, the endpoint-security layer is already inside that spend. Getting the exact entitlement confirmed for your specific agreement is still worth a written check with your Microsoft licensing rep or reseller before you plan a budget around it — SKU inclusions shift, and “what’s bundled in E5” is not always identical to what a given contract actually enables until someone checks the tenant.
For institutions not already on E5/A5, Microsoft also sells Defender for Endpoint as a standalone add-on (Microsoft Defender Suite priced around $12/user/month as of a 2026-08-26 check of Microsoft’s own pricing page, layered on top of an E3-equivalent prerequisite) — at which point you’re no longer comparing “already paid for” against GravityZone’s separate cost, you’re comparing two real line items, and the calculus below applies more directly.
See EDR vs. antivirus: which does a research group need for the underlying distinction between what Defender’s baseline AV layer covers and what full EDR (either vendor) adds on top.
Tip: try code CASRAI at checkout for 15% off, if the offer is currently active for this program — codes vary by vendor and aren’t guaranteed.
Where Bitdefender GravityZone actually earns its cost
Bitdefender GravityZone is not a better antivirus engine than Defender in any way that shows up in most independent lab tests — both consistently score well. The reason a research IT office pays for it separately is operational, not detection-quality:
- Heterogeneous lab-equipment estates. A core facility running instrument-control PCs on old Windows builds vendors won’t let you patch, plus Linux workstations for imaging/sequencing pipelines, plus the odd macOS analysis rig, is exactly the environment Defender’s tooling assumes less of — GravityZone’s agent support and single console are built for that mix from the start, not retrofitted onto it.
- Non-Windows endpoint depth. If a meaningful share of your managed fleet is Linux (common in bioinformatics cores, HPC-adjacent workstations, and some imaging equipment), GravityZone’s Linux agent and policy coverage is more mature than treating Linux as a bolt-on inside a primarily Microsoft-365-oriented security stack.
- Centralized cross-platform reporting outside the Microsoft ecosystem. An office that doesn’t want its whole security posture living inside Microsoft 365 Defender/Sentinel — because procurement spans multiple vendors, or because a specific grant/facility needs to report independently of central IT’s M365 tenant — gets a genuinely separate, vendor-neutral console with GravityZone.
- Devices outside the licensed-seat model entirely. Shared lab PCs, kiosk-style instrument terminals, and equipment that doesn’t map cleanly to a named-user M365 license are exactly where “per-seat E5 already covers it” stops being true — GravityZone licenses per endpoint, which fits that shape of estate better.
None of that is universal. A department that’s essentially all managed Windows/Mac laptops already inside E5/A5, with no core-facility instrument sprawl, is very unlikely to get enough incremental value from GravityZone to justify a second endpoint-security bill. Say that plainly to whoever’s approving the budget line, rather than assuming a second EDR product is automatically worth stacking on. See our GravityZone review for a fuller look at tier coverage and independent test results, and GravityZone Business vs. Premium if you’ve already decided GravityZone is the right call and need to pick a tier.
Pricing reality: one has a public number, the other doesn’t
Microsoft publishes list pricing for its Defender/E5 SKUs (the ~$12/user/month standalone add-on figure above, plus published E3/E5 seat pricing). Bitdefender GravityZone, by contrast, has no public per-device list price for its business tiers — the number is quoted at checkout against your actual endpoint count, and that figure was re-confirmed as still true on a 2026-08-26 check. Be skeptical of any third-party page that states a specific GravityZone per-device rate as if it were a stable list price; get a real quote for your device count instead of budgeting off an aggregator’s number.
The honest verdict
If your institution already licenses M365 E5 or A5: Defender for Endpoint Plan 2 is already running, its marginal cost on top of what you’re already paying is close to zero, and that is a legitimate, sufficient reason not to add GravityZone for a mostly-managed-Windows/Mac fleet. Don’t let a vendor pitch talk your office into a second EDR product “just in case” when the honest answer is that you’re already covered for that estate shape.
Where GravityZone genuinely earns its separate line item is the messier estate: instrument PCs that can’t be patched on Microsoft’s timeline, meaningful Linux/macOS share outside the core M365-managed fleet, shared or kiosk-style lab devices that don’t fit a named-user license, or a real organizational need for a security console independent of the central M365 tenant. That’s a real, common shape for a research institution with active wet-lab or core-facility operations — it’s just not every institution, and a department without that heterogeneity should not expect to recoup a second subscription’s cost in better protection.
For institutions weighing a fully separate EDR vendor rather than either of these two, CrowdStrike Falcon alternatives and Huntress vs. CrowdStrike cover the broader competitive set, and CMMC compliance for research institutions is worth reading if your endpoint-security choice is actually being driven by a federal contracting requirement rather than a general risk assessment — that changes which controls are mandatory versus optional.
Can you run both, or should you migrate cleanly?
Running two full real-time AV/EDR engines on the same endpoint is not recommended by either vendor — overlapping real-time scanners commonly cause performance conflicts and, in Windows’ case, Defender itself automatically drops to passive mode when it detects another registered antivirus product. In practice institutions choose one as the primary endpoint agent per device rather than layering both everywhere. A common, defensible pattern for a mixed estate: Defender as the primary agent on the managed Windows/Mac fleet already inside E5/A5, GravityZone scoped specifically to the lab-equipment and non-Windows endpoints where it earns its cost — rather than an all-or-nothing, institution-wide switch. Confirm the specific coexistence/passive-mode behavior with your own MDM/policy setup before assuming it, since exact behavior can depend on how Defender is centrally managed in your tenant.
Frequently asked questions
Does Microsoft 365 E5 already include what Bitdefender GravityZone provides?
For a mostly Windows/Mac, mostly-managed fleet, largely yes — M365 E5/A5 bundles Defender for Endpoint Plan 2, which covers the same core EDR ground (detection, investigation, automated remediation) that GravityZone’s business tiers provide. What it doesn’t replicate as cleanly is GravityZone’s depth on non-Windows/legacy endpoints and a security console independent of the Microsoft 365 ecosystem. Confirm your specific tenant’s entitlement with your licensing rep rather than assuming from the SKU name alone.
Is GravityZone worth paying for if we already have Microsoft Defender?
Only in specific cases: a genuinely heterogeneous estate (lab-equipment PCs, meaningful Linux/macOS share, shared or kiosk devices outside the named-user license model) or an organizational requirement for a security console that isn’t Microsoft’s own. If your fleet is essentially all managed Windows/Mac already inside E5/A5, the honest answer is that the marginal benefit is unlikely to justify a second subscription.
Is Bitdefender a Chinese or Russian company?
No. Bitdefender is a Romanian company, dual-headquartered in Bucharest, Romania and San Antonio, Texas, founded in 2001 by Florin Talpeș; it is privately held with the founders retaining majority ownership as of its 2007 spin-out as an independent business. It has no Chinese or Russian ownership. This question comes up often enough in security-vendor due diligence that it’s worth stating plainly rather than leaving procurement to find conflicting claims online.
Does GravityZone protect non-Windows lab equipment?
GravityZone’s agent coverage extends to Linux and macOS alongside Windows, which is the main practical reason it gets chosen over a Microsoft-365-centric stack for research environments with meaningful non-Windows endpoints — instrument-control Linux boxes, imaging workstations, and similar equipment. Confirm agent support for your specific OS/version against Bitdefender’s current supported-platforms list before purchasing, since exact version support changes over time.
Can we run Microsoft Defender and Bitdefender GravityZone on the same device?
Not recommended as a default. Two full real-time AV/EDR engines competing for the same file-system hooks is a known source of performance conflicts, and Windows itself will typically drop Defender to passive mode once it detects another registered antivirus product active on the device. Pick one primary agent per endpoint rather than layering both everywhere; a mixed estate can reasonably run Defender on the managed M365 fleet and GravityZone specifically on the lab-equipment/non-Windows endpoints it’s better suited to.
