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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
6.3
Office 365 delivers cost savings and improved productivity, benefiting medium to large enterprises with enhanced collaboration and security features.
Sentiment score
3.9
Slack Business - Enterprise boosts productivity and coordination, though some users desire pricing improvements despite notable time-saving benefits.
Internal surveys show a 20% increase in team productivity due to better collaboration in Microsoft Teams.
System Engineer at a retailer with 10,001+ employees
Though money is not saved directly, time is saved significantly due to its user-friendliness, reducing the need for extensive user training.
IT operation manager at a tech vendor with 1,001-5,000 employees
 

Customer Service

Sentiment score
4.2
Microsoft's customer service is quick and effective for many, but some users find response times and support consistency lacking.
Sentiment score
6.0
Users praise the responsive, efficient support, especially on Twitter, valuing its reliability and accessibility for complex tasks.
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
For complex issues, premium support tickets are usually handled within a few hours, providing a great experience.
System Engineer at a retailer with 10,001+ 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
When I connected to Slack Business - Enterprise API, tutorials and documentation were available online.
Da at hanasoft
If something was beyond their hands, then it would only be escalated to the external Slack team.
Senior Consultant at a consultancy with 10,001+ employees
 

Scalability Issues

Sentiment score
7.5
Office 365 offers scalable infrastructure enabling seamless growth and efficient user management, suitable for expanding organizations of all sizes.
Sentiment score
7.3
Slack Business - Enterprise is highly scalable and adaptable for various team sizes, with improvements enhancing its flexibility.
Office 365 offers virtually limitless scalability.
System Engineer at a retailer with 10,001+ employees
Whenever scaling up is required, procuring additional licenses is easy unless it is under an EA plan.
IT operation manager at a tech vendor with 1,001-5,000 employees
Slack is endlessly scalable.
Application Security Manager at Interact Intranet
Slack Business - Enterprise is a scalable product fitting for small businesses as well as enterprises, with no limitations on the number of users.
Da at hanasoft
Slack is not as comprehensive as Microsoft Teams in terms of scheduling and hosting meetings.
Data Engineer at BlazeClan Technologies
 

Stability Issues

Sentiment score
7.4
Office 365 is highly stable and reliable, with most users rating its performance and dependability between eight to ten.
Sentiment score
7.8
Slack Business - Enterprise is highly stable with minor mobile lagging, praised desktop functionality, and often scores 8-10 for stability.
Microsoft provides a 99.9% financially backed guarantee.
System Engineer at a retailer with 10,001+ employees
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
I do not see glitches, latency issues, or downtime.
Da at hanasoft
 

Room For Improvement

Office 365 faces issues with cost, frequent updates, integration, performance, and a demand for better features and support.
Enterprise users struggle with Slack's integrations, video features, security, and request improved collaboration, interface, and accessibility enhancements.
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
The interface for the security and compliance center could be simplified.
System Engineer at a retailer with 10,001+ employees
It has been observed that support personnel often lack hands-on experience, and more training is required.
IT operation manager at a tech vendor with 1,001-5,000 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
There are a lot of integrations and custom integrations available, but I believe there are opportunities to make those integrations much easier and faster, particularly for business or non-technical people.
Co Founder at a tech consulting company with 11-50 employees
I would rate it a ten if it comes with some AI features, particularly using generative AI to produce summarization and other kinds of insights from communication in a more secure, data-secure way.
Senior Consultant at a consultancy with 10,001+ employees
 

Setup Cost

Office 365 offers competitive pricing with flexible plans, providing value through scalability, integration, and cost-effective discounts for businesses.
Slack Business offers varied pricing with costs from $15-$20 per user monthly, but there is also a free version.
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
My experience with pricing, setup cost, and licensing for Office 365 is that it is moderate.
IT operation manager at a tech vendor with 1,001-5,000 employees
 

Valuable Features

Office 365 boosts productivity with cloud collaboration, device integration, AI tools, and secure, flexible apps like Teams and OneDrive.
Slack Business - Enterprise offers seamless integrations, efficient communication, API support, and productivity via customizable channels and cross-platform access.
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
Slack Business - Enterprise is beneficial for us primarily because the API was very beneficial, and that is the main one;
Da at hanasoft
We use the incoming webhook to push end results of automation, which makes our life easier by allowing us to easily check the status of our automation jobs through our corporate phone while in Slack itself.
Senior Consultant at a consultancy with 10,001+ employees
 

Categories and Ranking

Office 365
Average Rating
8.6
Reviews Sentiment
6.2
Number of Reviews
152
Ranking in other categories
Content Collaboration Platforms (1st)
Slack Business - Enterprise
Average Rating
8.4
Reviews Sentiment
5.9
Number of Reviews
82
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 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

BasilJiji - PeerSpot reviewer
System Engineer at a retailer with 10,001+ employees
Collaboration has transformed how our teams work and Copilot now drives faster daily decisions
The interface for the security and compliance center could be simplified. It changes frequently, which can make it somewhat difficult for admins to stay up-to-date on where specific settings are located. The compliance center modification or improvement of Office 365 needs to be introduced. The rest of the features feel acceptable to me. The reason it is not a ten is because of the complexity of managing the vast array of admin settings, which requires a specialized IT team. Even though it meets industry standards for decent security compliance such as SOC and HIPAA, the complexity of managing the admin settings needs to improve.
Akhil Viswam - PeerSpot reviewer
Senior Consultant at a consultancy with 10,001+ employees
Threaded collaboration has transformed how our team tracks tickets and monitors automation updates
One suggestion I would make for improving Slack Business - Enterprise is the support of multimedia such as images and videos that we can easily share through Slack. That would be great. Additionally, another thing is AI integration; if Slack has some AI capabilities to get insights about conversations or summarization, that would be a great feature. If Slack has an AI feature that can summarize a particular Slack thread and provide a summary of that, that would be a great feature for us. I would rate it a ten if it comes with some AI features, particularly using generative AI to produce summarization and other kinds of insights from communication in a more secure, data-secure way.
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Top Industries

By visitors reading reviews
Computer Software Company
17%
Outsourcing Company
11%
Manufacturing Company
8%
Performing Arts
7%
Performing Arts
20%
Financial Services Firm
12%
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 Enterprise70
By reviewers
Company SizeCount
Small Business56
Midsize Enterprise13
Large Enterprise23
 

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.
880,315 professionals have used our research since 2012.