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Office 365 vs Slack 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
7.3
Organizations benefited from Office 365 with cost savings, productivity enhancements, flexibility, integration, improved security, and valuable Microsoft support.
Sentiment score
7.4
Slack boosts productivity and collaboration with a 40% ROI, praised for efficiency despite some desiring lower pricing.
 

Customer Service

Sentiment score
4.2
Office 365 customer service is highly rated for responsiveness, but some users prefer internal IT or community resources.
Sentiment score
7.1
Slack's reliable service rarely requires support, but customer service is responsive and effective, receiving high praise overall.
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
7.8
Office 365 efficiently scales to accommodate organizational growth, handling thousands of users with high adaptability and licensing flexibility.
Sentiment score
7.6
Slack efficiently scales for teams of all sizes, though free version limitations and management of many channels can be challenging.
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
Users find Office 365 reliable, appreciating improvements and support, despite minor issues with Excel macros and Teams connectivity.
Sentiment score
7.7
Slack is largely praised for its stability and reliability, with occasional minor issues typically related to integrations or updates.
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 faces challenges with platform compatibility, performance, costs, integration, and requires enhancements in user-friendliness and documentation.
Users suggest improvements in Slack's video chat, organization, integrations, interface, security, mobile capabilities, and non-developer functionalities.
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 provides scalable licensing plans offering good value and flexible pricing, although setup can be complex for larger enterprises.
Slack's free version suits small teams, while enterprises prefer paid plans for security, costing 15-20 USD per user.
 

Valuable Features

Office 365 enhances productivity with strong integration, collaboration tools, AI features, scalability, cloud storage, and comprehensive app support.
Slack excels in chat functionalities, app integrations, customization, productivity tools, and offers a seamless, secure communication platform.
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.
We have created some error alerts and notification-related channels in the Workato recipe itself, where if we encounter any production issue errors or alerts, we receive error notifications with descriptions, error messages, and recipe names in a dedicated production error alerts Slack channel.
 

Categories and Ranking

Office 365
Average Rating
8.6
Reviews Sentiment
6.7
Number of Reviews
143
Ranking in other categories
Content Collaboration Platforms (2nd)
Slack
Average Rating
8.4
Reviews Sentiment
7.5
Number of Reviews
76
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 6.9%, up 5.9% compared to last year.
Slack, on the other hand, focuses on Enterprise Social Software, holds 12.8% mindshare, up 10.0% since last year.
Content Collaboration Platforms
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.
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Top Industries

By visitors reading reviews
Educational Organization
51%
Computer Software Company
8%
Financial Services Firm
4%
Manufacturing Company
4%
Educational Organization
50%
Computer Software Company
11%
Financial Services Firm
8%
University
4%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What is your experience regarding pricing and costs for Office 365?
For pricing, I think it's fairly priced, I would rate it 8.
What needs improvement with Office 365?
The areas of Office 365 that have room for improvement are what should be better in this solution.
What is your primary use case for Office 365?
A typical use case for Office 365 is how I primarily use this solution.
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?
Sometimes Slack behaves unexpectedly and shuts down without notification or support communication. There is a need to add a call group feature to facilitate scheduling and conducting meetings withi...
 

Comparisons

 

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 and other solutions. Updated: April 2025.
860,632 professionals have used our research since 2012.