Compare K-9 Mail and Microsoft 365 
Featured Products
At a Glance
Market Segments
Small-Business (46.2% of reviews)
Mid-Market (35.4% of reviews)
Entry-Level Pricing
No pricing available
$6.00 1 User Per Month
K-9 Mail
Star Rating
(13)4.5 out of 5
Market Segments
Small-Business (46.2% of reviews)
Pros & Cons
Not enough data
Entry-Level Pricing
No pricing available
Learn more about K-9 MailMicrosoft 365
Star Rating
(5,752)4.6 out of 5
Market Segments
Mid-Market (35.4% of reviews)
Pros & Cons
Entry-Level Pricing
$6.00 1 User Per Month
Browse all 3 pricing plansSummary
AI Generated Summary
AI-generated. Powered by real user reviews.
- G2 reviewers report that Microsoft 365 excels in overall user satisfaction, with a strong focus on ease of use and integration across its suite of applications. Users appreciate the ability to seamlessly switch between tasks and share files directly from applications like OneNote and Excel, which significantly enhances productivity.
- Users say K-9 Mail stands out for its open-source nature, providing a sense of security that many find appealing. Reviewers highlight its advanced features, such as end-to-end encryption via PGP, making it a preferred choice for those prioritizing privacy in their email communications.
- According to verified reviews, Microsoft 365's implementation process is notably smooth, with many users praising the intuitive onboarding experience. This ease of setup allows teams to quickly adapt and start utilizing the software effectively, which is a significant advantage for businesses.
- Reviewers mention that K-9 Mail offers a high degree of customization, allowing users to configure their email experience to suit their specific needs. This flexibility is particularly appreciated by those who require a tailored email client for their Android devices.
- G2 reviewers highlight the quality of support provided by Microsoft 365, noting that users feel well-supported throughout their experience. The availability of resources and assistance contributes to a more positive overall experience, especially for businesses that rely on timely support.
- Users report that while K-9 Mail is simple to use, it may not match the comprehensive feature set of Microsoft 365. Some users find that the lack of recent updates and reviews indicates a need for improvement in areas like user engagement and support, which could enhance its appeal in a competitive market.
Pricing
Entry-Level Pricing
K-9 Mail
No pricing availableMicrosoft 365
Microsoft 365 Business Basic
$6.00
1 User Per Month
Business Basic combines web and mobile versions of the Office apps, business email with Exchange, user management, 1 TB of OneDrive storage, and Teams for up to 300 users.
- Identity, access, and user management for up to 300 employees
- Custom business email (you@yourbusiness.com
- Web and mobile versions of Word, Excel, PowerPoint, and Outlook
Free Trial
K-9 Mail
No trial information availableMicrosoft 365
Free Trial is available
Ratings
Meets Requirements
8.8
11
9.3
4,750
Ease of Use
8.5
11
9.0
4,804
Ease of Setup
Not enough data
8.9
1,360
Ease of Admin
Not enough data
8.7
998
Quality of Support
8.3
8
8.5
4,015
Has the product been a good partner in doing business?
Not enough data
8.8
971
Product Direction (% positive)
7.1
12
8.8
4,684
Features by Category
File Management
Not enough data
9.3
183
Not enough data
9.3
180
Not enough data
9.4
178
Not enough data
9.0
172
Not enough data
8.9
174
Agentic AI - Cloud Content Collaboration
Not enough data
8.6
78
Not enough data
8.7
77
Not enough data
8.8
78
Collaboration
Not enough data
9.2
178
Not enough data
9.5
180
Not enough data
9.1
179
Not enough data
8.8
174
Administration
Not enough data
9.2
173
Not enough data
9.2
173
Not enough data
9.1
170
Not enough data
8.9
169
Not enough data
8.8
164
Not enough data
9.4
175
Platform
Not enough data
9.3
187
Not enough data
8.8
181
Not enough data
9.0
181
Not enough data
8.8
182
Communication
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Content Management
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Productivity Tools
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Administration
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Business Instant Messaging
Not enough data
9.5
182
Not enough data
9.3
181
Not enough data
8.8
178
Business Instant Messaging
Not enough data
9.1
181
Not enough data
9.2
182
Business Instant Messaging
Not enough data
9.1
179
Not enough data
9.2
183
Not enough data
9.0
177
Generative AI - Business Instant Messaging
Not enough data
8.7
131
AI - Business Instant Messaging
Not enough data
8.6
131
Not enough data
8.6
132
Not enough data
8.5
132
Not enough data
8.7
135
Agentic AI - Business Instant Messaging
Not enough data
8.6
85
Not enough data
8.5
85
Presenter Tools
Not enough data
8.9
125
Not enough data
8.5
126
Not enough data
8.2
123
Not enough data
8.6
124
Conferencing Options
Not enough data
9.0
130
Not enough data
9.0
131
Not enough data
9.0
135
Application Tools
Not enough data
8.8
123
Not enough data
8.7
124
Not enough data
8.8
125
Agentic AI - Screen Sharing
Not enough data
8.2
39
Platform Basics
Not enough data
8.7
166
Not enough data
8.8
165
Not enough data
9.1
167
Platform Content
Not enough data
8.8
166
Not enough data
8.3
164
Not enough data
8.6
156
Not enough data
9.1
166
Platform Additional Functionality
Not enough data
8.9
161
Not enough data
8.9
159
Not enough data
9.1
169
Generative AI
Not enough data
8.2
109
Not enough data
8.0
105
Not enough data
7.3
104
Not enough data
8.0
106
Not enough data
7.2
103
Not enough data
7.9
104
Not enough data
7.6
102
Inbox Tools
Not enough data
8.9
214
Not enough data
9.0
212
Not enough data
9.0
213
Not enough data
9.1
212
Coordination Tools
Not enough data
9.2
219
Not enough data
9.0
213
Not enough data
8.7
209
Software Options
Not enough data
9.3
218
Not enough data
8.8
216
Email Client - Agentic AI
Not enough data
8.3
79
Not enough data
8.2
80
Calculating
Not enough data
9.2
184
Not enough data
9.1
182
Insights
Not enough data
8.7
180
Not enough data
9.1
179
Editing
Not enough data
8.8
180
Not enough data
8.8
181
Not enough data
8.9
176
Functionality
Not enough data
8.5
177
Not enough data
8.9
181
Not enough data
9.0
175
Not enough data
9.1
179
Applications
Not enough data
9.3
1324
Not enough data
9.0
1235
Not enough data
8.8
1202
Collaboration
Not enough data
9.0
1219
Not enough data
8.8
1096
Not enough data
8.7
1170
Management
Not enough data
8.9
1191
Not enough data
9.2
1232
Not enough data
9.2
1266
Agentic AI - Office Suites
Not enough data
8.1
129
Not enough data
8.2
135
Collaboration Tools
Not enough data
9.1
194
Not enough data
9.1
193
Not enough data
8.6
188
Not enough data
9.2
191
Not enough data
9.2
189
Meeting Coordination
Not enough data
9.2
197
Not enough data
9.0
190
Not enough data
9.1
190
Not enough data
9.1
185
Software Type
Not enough data
9.0
195
Not enough data
9.1
191
Not enough data
9.2
193
Agentic AI - Video Conferencing
Not enough data
8.5
77
Not enough data
8.4
76
Not enough data
8.3
76
Survey Management
Not enough data
8.8
47
Not enough data
9.0
44
Not enough data
8.7
45
Not enough data
8.9
46
Survey Customization
Not enough data
8.6
46
Not enough data
8.8
47
Not enough data
8.7
45
Not enough data
8.8
45
Survey Insights
Not enough data
8.9
45
Not enough data
9.0
44
Not enough data
9.0
44
Not enough data
9.0
47
Agentic AI - Survey
Not enough data
9.2
13
Not enough data
8.7
13
Not enough data
8.8
13
Calendar View
Not enough data
9.0
203
Not enough data
8.9
206
Shared Calendar
Not enough data
9.0
206
Not enough data
8.9
203
Accessibility
Not enough data
8.8
194
Not enough data
8.7
195
Integration
Not enough data
8.9
196
Not enough data
8.7
199
Not enough data
8.8
197
Notifications
Not enough data
9.0
199
Not enough data
8.6
196
Generative AI
Not enough data
7.8
138
Not enough data
8.0
134
Not enough data
7.9
133
Agentic AI - Calendar
Not enough data
7.7
74
Notifications
Not enough data
9.0
112
Not enough data
8.7
110
Not enough data
8.9
109
Settings
Not enough data
9.1
114
Not enough data
9.1
110
Not enough data
9.0
110
Personalization
Not enough data
8.6
109
Not enough data
8.8
108
Integrations
Not enough data
8.9
111
Not enough data
8.9
105
Not enough data
8.3
105
Not enough data
9.0
108
Not enough data
8.7
105
Generative AI
Not enough data
8.5
80
Not enough data
8.5
79
Not enough data
8.2
79
Not enough data
8.4
80
Not enough data
8.3
80
Agentic AI - Online Appointment Scheduling
Not enough data
8.8
44
Not enough data
8.9
44
Not enough data
8.9
44
Design
Not enough data
8.8
234
Not enough data
8.9
237
Not enough data
8.7
235
Collaboration
Not enough data
9.2
239
Not enough data
9.2
240
File Types
Not enough data
9.4
244
Not enough data
9.1
241
Not enough data
8.6
232
Edit & Revise
Not enough data
8.9
241
Not enough data
8.8
235
Not enough data
9.2
242
Integrate & Embed
Not enough data
8.8
234
Not enough data
8.6
234
Not enough data
8.9
236
Operating System
Not enough data
9.4
240
Not enough data
8.5
232
Not enough data
7.9
224
Generative AI
Not enough data
8.1
177
Not enough data
8.1
176
Not enough data
7.8
172
Not enough data
8.0
175
Not enough data
7.9
170
Agentic AI - Document Creation
Not enough data
8.4
94
Sorting & Filtering
Not enough data
8.9
219
Not enough data
9.1
215
Not enough data
8.6
209
Not enough data
8.9
214
Integrations
Not enough data
9.3
218
Not enough data
8.5
207
Not enough data
8.2
203
Time Management
Not enough data
8.9
207
Not enough data
9.1
215
Not enough data
8.8
210
Generative AI
Not enough data
8.4
158
Not enough data
8.3
157
Not enough data
8.5
158
Agentic AI - Email Management
Not enough data
8.6
89
Not enough data
8.6
89
Categories
Categories
Shared Categories
K-9 Mail and Microsoft 365 are categorized as Email Client
Unique Categories
K-9 Mail has no unique categories
Microsoft 365 is categorized as Email Management, Business Instant Messaging, Screen Sharing, Spreadsheets, Presentation, Online Appointment Scheduling, Document Creation, Cloud Content Collaboration, Office Suites, Calendar, Survey, and Video Conferencing
Reviews
Reviewers' Company Size
K-9 Mail
Small-Business(50 or fewer emp.)
Mid-Market(51-1000 emp.)
Enterprise(> 1000 emp.)
Microsoft 365
Small-Business(50 or fewer emp.)
Mid-Market(51-1000 emp.)
Enterprise(> 1000 emp.)
Small-Business
(50 or fewer emp.)
Mid-Market
(51-1000 emp.)
Enterprise
(> 1000 emp.)
Reviewers' Industry
Computer Software
15.4%
Venture Capital & Private Equity
7.7%
Translation and Localization
7.7%
Retail
7.7%
Pharmaceuticals
7.7%
Other
53.8%
Information Technology and Services
10.7%
Education Management
5.8%
Computer Software
5.2%
Higher Education
4.9%
Hospital & Health Care
4.1%
Other
69.3%
Alternatives
Discussions
K-9 Mail has no discussions with answers
how to transfer microsoft office to another computer
4 Comments
EJ
To complete this tasks, you have to have a product key and use that key to set up Microsoft on the second computer.Read more
what is the best way to make sure you never lose any work if your computer crashes
3 Comments
CS
Open any program in the office suite, click on file menu and then click on options, then click on the save tab and configure the autosave every minute.Read more
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