# Contractors Validate FIPS Application Compatibility

Organizations handling Controlled Unclassified Information are reporting that enabling Windows FIPS mode can cause compatibility or interoperability problems in some applications and data flows, while other environments experience few issues. Reported examples include QuickBooks Desktop, DocuWare, older line-of-business software, CAC access, Adobe document handling, wireless performance, and SIEM log transfers. The setting alone does not establish that every application uses FIPS-validated cryptography, making application-level validation relevant to security requirements and contractor technology decisions.

- Procurement teams should include FIPS-mode compatibility, vendor support, and remediation options in evaluations of software used in CUI environments.
- Contractors can pilot the setting across representative applications and data flows before deployment, testing the workflows identified in their own environments.
- Companies should confirm which applications and components use FIPS-validated cryptography rather than treating the Windows setting as evidence of end-to-end validation.

**Jurisdictions:** federal
**Industries:** Information Technology
**Topics:** Cybersecurity
**Published:** October 09, 2026

### Government Entities
- National Institute of Standards and Technology (NIST)

### Vendors
- Microsoft ()
- DocuWare ()
- Intuit ()
- Adobe ()

### Key Quotes
> The best thing to do is limit where you need FIPS through data flow, especially for rev2.
> — Commenter

### Sources
- [More FIPS talk.. FIPS Mode question - what "breaks"?](https://www.reddit.com/r/CMMC/comments/1x1mezs/more_fips_talk_fips_mode_question_what_breaks) - reddit-cmmc