Try our new research platform with insights from 80,000+ expert users

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.
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.
 

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.
Slack is not as comprehensive as Microsoft Teams in terms of scheduling and hosting meetings.
A user who engages with Slack daily and utilizes various features would provide more valuable insights.
 

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.
At this time, whatever they have meets the needs, and they are expanding the number of participants to Team meetings and other features.
It integrates with various systems, allowing us to manage site reliability, availability, and reliability.
Slack's stability is a perfect 10.
Occasionally, Slack behaves unexpectedly and shuts down, which can be irritating, especially when I am in the middle of a task.
 

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.
I'm not aware of the support calls users are placing, but in 10 years I probably had five or six support tickets placed.
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.
We can also improve the creation of channels, particularly in terms of privacy, security, flexibility, and the addition of members to newly created channels.
Configuring chats and pinning in Teams is easier, even though Slack has these features, they are not intuitive enough to engage with.
There is a need to add a call group feature to facilitate scheduling and conducting meetings within Slack.
 

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.
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.
 

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.
The most valuable feature is SharePoint, where we can easily put files and make them accessible to any person who has access.
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.
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.
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.
The integration with Google Calendar is easy to use and allows us to receive notifications before meetings.
 

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 (2nd)
 

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 9.6%, up 5.7% compared to last year.
Slack Business - Enterprise, on the other hand, focuses on Enterprise Social Software, holds 15.8% mindshare, up 10.8% since last year.
Content Collaboration Platforms Market Share Distribution
ProductMarket Share (%)
Office 3659.6%
Dropbox Business - Enterprise10.1%
Google Workspace9.8%
Other70.5%
Content Collaboration Platforms
Enterprise Social Software Market Share Distribution
ProductMarket Share (%)
Slack Business - Enterprise15.8%
Microsoft Teams14.0%
Atlassian Confluence8.9%
Other61.3%
Enterprise Social Software
 

Featured Reviews

Gary Cook - PeerSpot reviewer
Access to advanced features boosts productivity despite pricing concerns in developing regions
I need to do maintenance for Office 365 very seldom, once a year. In the maintenance process for Office 365, we have about 12 people involved. For the maintenance side of Office 365, only one person is involved. Looking at Office 365's pricing, I would give it a 4 on a scale from 1 to 10. My overall rating for Office 365 is an 8 out of 10, but for the product itself, I would give it a 10. I would definitely recommend Office 365 to other businesses, probably a 9 out of 10 for recommendation. This is only because of its price and the fact that they do not take into account developing countries such as South Africa, where they should give us more favorable prices or local prices. We do not have a partnership with Microsoft, which is a sore point for us. We have reached out to Microsoft South Africa, and they are very hard to contact and largely uncooperative. We are a B-Level 2 and a B-Level 1, which are local affirmative action ratings that companies get. Level 1 is the highest, and Level 8 is the lowest. We hold amongst the highest BEE ratings, but we have not found Microsoft South Africa to be forthcoming or very open. We should have a partnership with them, and we run Power BI as we are a Power BI shop now. I strongly would want to see a box within Office 365 for our team to have ChatGPT through OpenAI as well. We use Excel as a data source for many tasks and find that it integrates really well with Python. We write a lot of Python code and use Excel as a data sheet many times, and we operate through SQL and other zero elements as well. From an Office 365 viewpoint, we find that with Copilot and Python and Excel's provision for Python, it is very useful.
Awais Mehmood - PeerSpot reviewer
Automation features and user-friendly interface support seamless communication
Slack is very supportive in terms of communication between my colleagues and clients. While working with the reimbursement feature, I found the automation capabilities on Slack to be incredibly useful, allowing me to automate messages for specific dates or times and even to greet someone on their birthday. I haven't specifically used the channel organization feature of Slack, as I am added to channels, but I use it with Airtable, which automates notifications to a specific Slack channel when a user fills out a form on our website. 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.
report
Use our free recommendation engine to learn which Content Collaboration Platforms solutions are best for your needs.
869,785 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Computer Software Company
19%
Outsourcing Company
8%
Performing Arts
7%
Manufacturing Company
7%
Performing Arts
19%
Computer Software Company
13%
Financial Services Firm
12%
University
9%
 

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?
My experience with the pricing, licensing, or setup costs with Office 365 is that it's the same thing; I'm not really involved with the pricing, so that's not my area of responsibility.
What needs improvement with Office 365?
I don't think of any areas that could be improved or things that I would want to see in the next releases of Office 365. Microsoft could improve their support; I don't deal with Office 365 or Offic...
What is your primary use case for Office 365?
The main use cases for Office 365 are both for our clients and internal use.
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.
869,785 professionals have used our research since 2012.