Microsoft 365 vs Skiff Comparison (2025)

What are the differences between Microsoft 365 and Skiff?

Forward Email Team
Written by
Forward Email TeamVerified
Published
1/1/25
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Microsoft 365.

Email Service Comparison

20 facts in comparison
Microsoft 365vs.Skiff

Microsoft 365

Grow your business with Microsoft 365
"Grow your business with Microsoft 365"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Skiff

Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)
"Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$72/yrPricing$3/mo
1000 GB pooledStorage15 GB
150 MBAttachments25 MB
NoOpen-Source❌ Skiff claims to be open-source, but their back-end is actually closed-source
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTP❌ Skiff does not support SMTP and forces vendor lock-in
YesIMAP❌ Skiff does not support IMAP and forces vendor lock-in
YesPOP3❌ Skiff does not support POP3 and forces vendor lock-in
NoAPINo
NoE2EE ⚠️ Supported, but Skiff manages your private keys and is closed-source
⚠️ Microsoft 365 does not support PGP/MIMEOpenPGP Yes
NoWKD Yes

Email Service Screenshots

Closed-source

Microsoft 365

Microsoft 365 is a closed-source email service. Their official description reads: Grow your business with Microsoft 365

Microsoft 365 is a closed-source email service.
Photo by Forward Email
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Closed-source

Skiff

Skiff is a closed-source email service. Its description from its website is: Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)

Skiff is a closed-source email service.
Photograph by Forward Email
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Compare Microsoft 365 with 79 email services