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Office 365 vs Slack Business - Enterprise comparison

 

Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
6.2
Office 365 offers cost savings and enhanced productivity, though ROI varies, especially for small companies with alternative options.
Sentiment score
5.6
Slack Business Enterprise had a 40% ROI, boosting productivity, content organization, and collaboration, though some desired better pricing.
 

Customer Service

Sentiment score
4.1
Microsoft Office 365 support is generally positive, noting responsiveness and resolution, though initial delays and navigation issues exist.
Sentiment score
6.2
Users rarely need Slack Enterprise support due to platform reliability; when contacted, support is quick and effective.
At times if you're trying to use their online support, they'll send you to an article that may or may not have anything to do with what you're looking for.
Controller/HR Manager/IT Manager at a manufacturing company with 11-50 employees
We tend to focus more on Workato for support, but internally we raise service requests with the infrastructure team for any issues related to Slack.
Integration Engineer
 

Scalability Issues

Sentiment score
7.4
Office 365 is scalable and adaptable, efficiently supporting large user bases with easy scaling through additional licenses.
Sentiment score
7.5
Slack Enterprise is scalable and supports large teams, though managing channels can be complex with growing user numbers.
Slack is endlessly scalable.
Application Security Manager at Interact Intranet
Slack is not as comprehensive as Microsoft Teams in terms of scheduling and hosting meetings.
Data Engineer at BlazeClan Technologies
A user who engages with Slack daily and utilizes various features would provide more valuable insights.
Webflow Developer at Qureos
 

Stability Issues

Sentiment score
7.4
Office 365 is highly stable, with minor issues on Mac, rated 8-10 for reliability and performance satisfaction.
Sentiment score
7.8
Slack Business - Enterprise is stable and reliable, though some users report occasional slowdowns, crashes, and notification issues.
The integration capabilities of Office 365 with Word, Excel, and Outlook with OneDrive for cloud storage have been smooth and work well.
Controller/HR Manager/IT Manager at a manufacturing company with 11-50 employees
At this time, whatever they have meets the needs, and they are expanding the number of participants to Team meetings and other features.
IT Administrator at a university with 51-200 employees
It integrates with various systems, allowing us to manage site reliability, availability, and reliability.
Application Security Manager at Interact Intranet
Slack's stability is a perfect 10.
Webflow Developer at Qureos
Occasionally, Slack behaves unexpectedly and shuts down, which can be irritating, especially when I am in the middle of a task.
Data Engineer at BlazeClan Technologies
 

Room For Improvement

Office 365 needs improved multilingual support, non-Windows performance, better third-party integration, enhanced security, AI features, and pricing adjustments.
Slack Business needs improved video, integration, performance, security, scalability, and user-friendliness with better pricing for freelancers.
I believe the choice of office apps often depends on the existing ecosystem of the business, and since Office 365 has comprehensive coverage, I am not missing any features that the competition provides.
React Native Team Lead at Visible Magic
I'm not aware of the support calls users are placing, but in 10 years I probably had five or six support tickets placed.
IT Administrator at a university with 51-200 employees
One of the big changes is when Microsoft updates anything, they will switch where some of the settings are and where to find them, which becomes a little frustrating because you're used to it in one spot and it's someplace else.
Controller/HR Manager/IT Manager at a manufacturing company with 11-50 employees
We can also improve the creation of channels, particularly in terms of privacy, security, flexibility, and the addition of members to newly created channels.
Integration Engineer
Configuring chats and pinning in Teams is easier, even though Slack has these features, they are not intuitive enough to engage with.
Application Security Manager at Interact Intranet
There is a need to add a call group feature to facilitate scheduling and conducting meetings within Slack.
Data Engineer at BlazeClan Technologies
 

Setup Cost

Office 365 pricing varies by features and user count, offering flexibility but can be costly for smaller businesses.
Users have mixed views on Slack pricing; it's deemed affordable by some and costly by others, influencing plan choices.
the cost of using the Microsoft ecosystem is higher than the combined cost of using Notion and Slack.
Project Management Associate at MPost
My experience with the pricing or licensing of Office 365 is that a lot of times we've gotten them when they've been on sale, so we've had really good pricing for the Microsoft products.
Controller/HR Manager/IT Manager at a manufacturing company with 11-50 employees
 

Valuable Features

Office 365 enhances remote work productivity with collaboration tools, seamless integration, real-time editing, and robust communication features.
Slack Business enhances team productivity through seamless integration, advanced organization, customizable notifications, and an intuitive interface.
It has improved productivity and functionality by providing all necessary tools in one suite.
CCC at FlowSec
The most valuable feature is SharePoint, where we can easily put files and make them accessible to any person who has access.
Project Management Associate at MPost
Office 365 has positively impacted my organization by making the salespeople more accurate because they've been able to use the features in Excel instead of relying on the calculator or adding machine.
Controller/HR Manager/IT Manager at a manufacturing company with 11-50 employees
In my experience, Slack is a stable product for communication, and I appreciate its automation features and integration of AI capabilities for enhancing specific functions.
Webflow Developer at Qureos
In managing releases via Slack channels, one major advantage over Teams is the ability to have threaded discussions, which helps in catching up on relevant discussions without the distraction of interleaved conversations.
Application Security Manager at Interact Intranet
The integration with Google Calendar is easy to use and allows us to receive notifications before meetings.
Data Engineer at BlazeClan Technologies
 

Categories and Ranking

Office 365
Average Rating
8.6
Reviews Sentiment
6.0
Number of Reviews
150
Ranking in other categories
Content Collaboration Platforms (1st)
Slack Business - Enterprise
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
78
Ranking in other categories
Enterprise Social Software (1st)
 

Mindshare comparison

While both are Messaging and Collaboration solutions, they serve different purposes. Office 365 is designed for Content Collaboration Platforms and holds a mindshare of 10.3%, up 4.7% compared to last year.
Slack Business - Enterprise, on the other hand, focuses on Enterprise Social Software, holds 11.5% mindshare, down 11.9% since last year.
Content Collaboration Platforms Market Share Distribution
ProductMarket Share (%)
Office 36510.3%
Google Workspace10.0%
Dropbox Business - Enterprise8.8%
Other70.9%
Content Collaboration Platforms
Enterprise Social Software Market Share Distribution
ProductMarket Share (%)
Slack Business - Enterprise11.5%
Microsoft Teams8.8%
Atlassian Confluence5.8%
Other73.9%
Enterprise Social Software
 

Featured Reviews

AG
Technical Manager at Landmark Group
Teams streamlines collaboration but Outlook experiences occasional slowness on Mac
Teams is a really good collaboration tool. You can work basically at any part of the world and communicate and collaborate with anybody, as long as they are connected to the internet. It helps with remote work, and although I don't work remotely, I have offices in Dubai and different geographical locations. It helps me connect with my colleagues and team who are not in the same geography as I am in Bangalore. Teams can facilitate team meetings, screen sharing, and organizing meetings.Regarding security, we have two-factor authentication governed by organizational policy. When trying to login to Office 365, Teams, or any Office 365 app, we are required to provide a password and use Microsoft Authenticator to sign in using a code. This is how two-factor authentication is implemented in our organization. Office 365 offers a suite of apps including OneNote, though I don't use it very often. In terms of integration with Microsoft ecosystem, it offers everything needed to get work done without any hassle.
SM
Director at Xander & Thomas
Has improved internal communication through simple messaging and faster search
It has become easier to use than Teams, which is the main benefit of Slack Business - Enterprise. It is simple and connected. Searching in Slack Business - Enterprise is very easy. Slack Business - Enterprise is superior compared to Teams. Slack Business - Enterprise is very stable. Granola (G R A N U L A) is an AI notetaker that is quite effective.
report
Use our free recommendation engine to learn which Content Collaboration Platforms solutions are best for your needs.
879,422 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Computer Software Company
19%
Outsourcing Company
10%
Manufacturing Company
8%
Performing Arts
7%
Performing Arts
20%
Financial Services Firm
13%
Computer Software Company
12%
University
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business62
Midsize Enterprise29
Large Enterprise68
By reviewers
Company SizeCount
Small Business54
Midsize Enterprise13
Large Enterprise21
 

Questions from the Community

What is your experience regarding pricing and costs for Office 365?
I didn't inquire about the specific costs of transitioning from the previous tools. However, I was informed that the cost of using the Microsoft ecosystem is higher than the combined cost of using ...
What needs improvement with Office 365?
I don't have any ideas off the top of my head at the moment about what I would improve about Office 365. I can't think of anything that frustrates me about the tools. I mentioned that I use Copilot...
What is your primary use case for Office 365?
We use the Microsoft Office 365 suite for personal purposes. We use Teams for communications, and we use Azure DevOps for some of our workflow management. I use Office 365 for Outlook for emails. I...
What do you like most about Slack?
Nowadays, we don't need to visit an HR portal. Our marketing and human resources teams directly share details about birthdays, upcoming events, and important dates in Slack. Whether it's a training...
What is your experience regarding pricing and costs for Slack?
I am not aware of pricing, setup costs, or licensing, due to my company's partnership with Slack.
What needs improvement with Slack?
The direct call feature could be enhanced, particularly when calling peers. When showing screens during calls, the screen sharing functionality is not as smooth as Google's offering. It appears to ...
 

Also Known As

Microsoft Office 365, Office 365 Enterprise, Office 365 Enterprise E1, Office 365 Enterprise E3, Office 365 Enterprise E5, Office 365 ProPlus, Office 365 Business, Office 365 Business Essentials, Office 365 Business Premium, Office 365 F1
No data available
 

Overview

 

Sample Customers

Me & the Bees Lemonade
Strava, The New York Times, Spotify, Blue Bottle Coffee Company, Eventbrite, Box, Circa, Stripe
Find out what your peers are saying about Office 365 vs. Slack Business - Enterprise and other solutions. Updated: April 2025.
879,422 professionals have used our research since 2012.