Office 365 vs Slack comparison

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Office 365

Comparison Buyer's Guide

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Executive Summary

We performed a comparison between Office 365 and Slack based on real PeerSpot user reviews.

Find out in this report how the two Content Collaboration Platforms solutions compare in terms of features, pricing, service and support, easy of deployment, and ROI.

To learn more, read our detailed Office 365 vs. Slack Report (Updated: April 2025).

Office 365 vs. Slack

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Helped 849,475 peers since 2012

Review summaries and opinions

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

Categories and Ranking

Office 365

Average Rating

8.6

Number of Reviews

Ranking in other categories

Content Collaboration Platforms (9th)

Slack

Average Rating

8.4

Reviews Sentiment

7.8

Number of Reviews

Ranking in other categories

Enterprise Social Software (3rd)

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 5.5%, down 6.7% compared to last year.
Slack, on the other hand, focuses on Enterprise Social Software, holds 12.7% mindshare, up 10.3% since last year.

Content Collaboration Platforms

Enterprise Social Software

Featured Reviews

Minos Pitsillides

IT Director at IT-Flow ltd

Excellent technical support, easy to install, but the price, while affordable, could be improved

Office 365 is scalable, but it is dependent on the situation. We don't have a problem with it from an organizational standpoint. They started with 100 employees and then added another 500 after six months, for a total of 600 employees. The setup of new users, new emails, and new applications to be assigned to the new users is straightforward. They also provide the PowerShell command, which they provided more, development type, like, for example, you can create users, not manually, but through a script that can create users, for example, 100 users in two, three minutes, and you don't do it manually. They're fantastic. My portfolio contains approximately 50 companies. Office 365 is our primary platform for the 50 companies. I only have one on G Suite, and the majority of them will be migrating from G Suite to 365 in the coming month.

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PaulButticaz

Account Manager at Eclipse Networks, Inc.

A competitive solution that improves collaboration and productivity

Slack has been around for a long time, and it's an industry leader. Of course, Salesforce owns Slack now and is starting to integrate into it. I have attended Slack conferences and met with product and support managers. They're an excellent organization. Choosing Slack depends on the organization's size, so you need to plan your deployment and make sure you put some controls and standards in place and not just turn it on. If you're a Slack shop, you will have to have something like a Zoom or Microsoft Teams platform for when you need to do video conferencing internally or externally. Many shops have both products, but they use Slack for collaboration, chat, and so on, and use Teams for video and audio conferences. At the end of the day, Slack is missing those capabilities, so either you're going to be a Slack/Zoom shop or you're going to be a Microsoft Teams shop. I rate Slack an eight out of ten.

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Quotes from Members

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

Pros

"It's nice that it's an all-in-one solution and everything is all in one place."

"The most valuable feature is the integration between net and mobile devices."

"The product helps us be more efficient. It helps us to have a standardized way of doing things."

"The technical support is outstanding."

"It has more features than somebody would expect, and it is worth taking a deeper look into the features available."

"There are no more server and hardware operational costs and downtime, updates, etc. for all the workloads available. Newer features and updates are available immediately. Can be managed from a single web interface. Cloud-based, so same experience for all users, regardless of location."

"The way the ERP presents information for the user is very good."

"It is very easy to deploy."

More Office 365 pros

"Slack is a very stable product."

"It offers customization options for various applications, including integrations with Zoom for video calls and a wide range of other integration plugins."

"Slack is a very collaborative tool that makes it easier for me to communicate with the onboarding and billing teams."

"I use Slack for communication with my colleagues."

"Slack's categorization of content and the availability of channels are highly valuable, as they keep communications organized."

"Slack is a powerpack bundle of features that help small or large organizations to handle teams and their tasks."

"Overall, it is a good idea as it works better than most solutions out there."

"One thing I like about Slack is the ability to change the color of Slack. It depends on my mood. When I'm having a bright day, I just change the background color of my Slack, which is nice."

More Slack pros

Cons

"They should do more testing before product releases."

"Sometimes the configurations of the error troubleshooting are pretty problematic and there are a lot of issues that happen even if you follow the step-by-step guides. They can work on fixing this issue. If there are a lot of issues in your Windows or your Office or anything, you restart your PC and it works. They need to get rid of this need."

"Microsoft Defender for Office 365 could use some customization, but this area for improvement is trivial."

"It could be more user-friendly for inexperienced people."

"I rate the support of Office 365 a four out of five."

"Integration with other platforms can be improved."

"I'd like to see them add more features in the future in order to continue to advance the product."

"The online applications have limited functionality compared to the local applications."

More Office 365 cons

"We could see improvement in Slack by having an integrated meeting tool. Currently, we rely on third-party integration tools like Zoom to schedule meetings. It would be much more convenient to schedule meetings directly within Slack without additional integrations. It needs to have calendar and CRM integrations as well."

"It could be more stable than one of its competitors."

"The tool is a bit slow."

"The mobile app needs improvement. It consistently misses notifications."

"Sometimes, the servers are not available."

"I would like to see a special feature for multiple people to collaborate on a document, working on it at the same time."

"I have found it cumbersome to create and set up groups, or channels."

"Slack's channel and chat management could be more intuitive. Configuring chats and pinning in Teams is easier, even though Slack has these features, they are not intuitive enough to engage with."

More Slack cons

Pricing and Cost Advice

"The pricing is good for all the features that we receive, e.g., Skype for Business."

"I would rate the solution 3 out of 5 for the price. I think Microsoft presents a good solution concerning the price."

"The price of Office 365 is very expensive."

"I think that we pay $9.99 USD per user, monthly."

"The pricing is not really high, but one can get the software with the license key for free."

"Good reporting and good value subscriptions for international calls."

"Licensing, billing, and accounting are available from the management interface."

"Most of the time, we purchase Microsoft Exchange licenses, which are less expensive and provide only an email platform and 50 gigabytes of email storage for free."

More Office 365 pricing and cost advice

"It is an affordable solution."

"The solution is expensive."

"Slack is not the cheapest solution, but that's okay."

"The pricing can range up to about twenty bucks a user. You can spend a lot of money, especially if you're talking about thousands of users. Generally speaking, Slack is less expensive than Teams. Slack doesn't include all the bells and whistles that Teams does. So you can go from a $6 license in Microsoft 365 to a $50 license per user per month, and there's a lot more you can do in the $50 license."

"When it comes to pricing, it is on the expensive side."

"The solution’s pricing is cheap."

"It is an expensive tool. We pay 15 to 20 USD monthly per user."

"I would rate the tool's pricing a four out of ten."

More Slack pricing and cost advice

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Top Industries

By visitors reading reviews

Educational Organization

78%

Computer Software Company

Financial Services Firm

Government

Educational Organization

80%

Computer Software Company

Financial Services Firm

University

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

Questions from the Community

What are the differences between SnapComms and Office 365?

Here are the key differences between SnapComms and Office 365: SnapComms is specifically designed for employee communications, while Office 365 is a suite of productivity tools for bus...

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...

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Compared 13% of the time

Atlassian Confluence vs Office 365

Compared 9% of the time

Box vs Office 365

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Compared 18% of the time

Chatter vs Slack

Compared 14% of the time

Atlassian Confluence vs Slack

Compared 12% of the time

ChatWork vs Slack

Compared 12% of the time

Microsoft Teams vs Slack

Compared 5% of the time

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Product Reports

Office 365

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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

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Overview

Office 365 is more than just Word, Excel, PowerPoint, and Outlook. It provides powerful services like business-class email, online storage, and teamwork solutions that you can access from anywhere. Bring teams and resources together with solutions like Microsoft Teams and Skype for Business that make working together more productive and enjoyable regardless of where participants are located. Easily implement security and privacy controls to help protect business data and devices against malicious threats and help you meet your compliance obligations. Automatic updates ensure your employees will always have the latest features and security updates.

Microsoft

Slack is where work happens. It’s a digital workspace that powers your organization — all the pieces and the people — so you can get things done.

Slack brings all your communication together in one place. It's real-time messaging, archiving and search for modern teams.

Sample Customers

Me & the Bees Lemonade

Strava, The New York Times, Spotify, Blue Bottle Coffee Company, Eventbrite, Box, Circa, Stripe

Office 365 vs. Slack