IRONKEEP vs Microsoft GCC High
Microsoft 365 GCC High is the compliance standard for defense contractors handling CUI and the right choice for large enterprises already in the Microsoft ecosystem. For small teams, the path into GCC High can be steep: a full tenant rebuild, an authorized partner, and a significant upfront investment.
| GCC High | IRONKEEP | |
|---|---|---|
| Migration time | 3-6 months | Hours |
| Year-one cost (25 users) | $50K-$200K+ | Founding member pricing |
| Authorized partner required | Yes | No |
| Tenant rebuild required | Yes | No |
| Email + storage bundled | Add-ons required | Included |
| Per-tenant encryption keys | No | ✓ |
The license is the easy part
GCC High now offers Business Premium at around $22 per user per month, a real option for small teams. But the license is not the hard part. Getting into GCC High is.
Any email platform switch involves importing mailboxes. But GCC High is not a normal switch. You cannot upgrade your existing Microsoft 365 tenant. GCC High is a completely separate cloud built on Azure Government. Every user account must be recreated, every SharePoint site rebuilt, every Teams channel reestablished, and every security policy reconfigured from scratch. This is not an IMAP import. It is a full infrastructure rip-and-replace that typically costs $50,000–$200,000 and takes months even for small organizations.
Enterprise E3 and E5 GCC High licenses (which add advanced eDiscovery, Defender for Endpoint Plan 2, and Purview Information Protection) run $54 or more per user per month. For a 25-person team on E3, that is over $16,000 per year in licensing alone, on top of the rebuild.
Everyone rebuilds, even if only a few handle CUI
GCC High forces organizations to either rebuild their entire tenant for all users or manage complex dual-tenant environments. Many employees (HR, finance, marketing) never touch CUI, but they all go through the same rip-and-replace. You cannot run half your team on commercial Microsoft 365 and half on GCC High under a single email domain without significant cross-tenant complexity.
External collaboration requires extra configuration
Collaborating with vendors, subcontractors, or primes outside your GCC High tenant requires cross-tenant B2B configuration. Guest access requires additional licensing. Sharing files with someone on commercial Microsoft 365 is not straightforward. For small contractors who collaborate constantly with external partners, this creates friction in every interaction.
GCC High is a separate environment
GCC High runs on Azure Government, a separate cloud from commercial Microsoft 365. New features arrive in the commercial environment first, then GCC, then GCC High. Some features are not available in GCC High at all. This is worth understanding when planning your team's workflow and tooling expectations.
You need a Microsoft partner just to get started
You cannot purchase GCC High directly from Microsoft. You need an authorized partner to provision your tenant, manage migration, and handle ongoing administration. This adds cost, complexity, and a dependency on a third party before you have even sent your first compliant email.
How IRONKEEP is different
IRONKEEP does not require you to rebuild your entire IT environment. Migrate your email, files, and contacts and get compliant in hours, not months. No tenant rip-and-replace, no authorized partner, no six-figure migration budget.
- Standard mailbox import: no infrastructure rebuild, no partner required
- Per-tenant encryption with zero-operator key access: a compromised platform key cannot unlock your data
- Minimal attack surface: purpose-built for compliance, not a sprawling productivity suite
- Designed for CMMC Level 2, NIST 800-171, DFARS, and ITAR
Start bidding on CMMC contracts sooner.
Founding member pricing goes away at launch.