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 850,760 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

100

Ranking in other categories

Content Collaboration Platforms (2nd)

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 6.3%, down 6.5% compared to last year.
Slack, on the other hand, focuses on Enterprise Social Software, holds 12.6% mindshare, up 10.0% 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

"The solution is quite intuitive and easy to use."

"Reliable without any glitches."

"It's very stable."

"The most valuable feature of this solution is the integration."

"It is stable."

"There's a lot there in terms of apps and features."

"My primary use case is for preparing presentations to teach, often on PowerPoint."

"Cloud-based management is valuable and software deployment is positive."

More Office 365 pros

"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 stable product."

"The most valuable feature for me was the different channels."

"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."

"When we work with a platform like Slack, we can have one source without merging different document versions."

"I like Slack's notifications. It is more user-friendly and pleasing than Teams."

"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."

"We use Slack for general communication, conference calls, and sharing screens because we have people working from different countries."

More Slack pros

Cons

"It needs improvements around its compatibility with non-Microsoft products."

"If two people update the same file, it causes issues."

"Their support is so terrible and unusable except during dire emergencies."

"The one big problem with the solution is if you are presenting in Teams and someone puts their hand up, you don't get a notification. If you are running a meeting and just presenting you don't know that people have their hands up and want to ask a question."

"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."

"Office 365 could be easier to use at first. Tutorials are needed to know how to use the solution."

"Security is still complex, but the admin console improving."

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

More Office 365 cons

"Slack could add additional and better integrations."

"I would like to be able to do live streaming on Slack. Slack allows Slack huddle where you can do a group call, but it is not very well-designed. I'm not sure if it is going very well, but live streaming is one thing that I would definitely love to see. When you use Zoom, I like how you can run webinars. If we could do that through Slack, it would become an all-integrated platform. I would also like to be able to schedule meetings using Slack, similar to Zoom."

"Slack does not have videoconferencing capabilities, which would have been nice."

"Sometimes Slack behaves unexpectedly and shuts down without notification or support communication."

"The solution needs to improve its scalability."

"The reason is we are moving towards a new CRM, so we have a suitable solution to integrate with the new CRM."

"The product should provide integration with other solutions like Gmail or Outlook."

"In Slack, there are areas for accessibility improvements."

More Slack cons

Pricing and Cost Advice

"The pricing is high and has actually caused us to limit the number of licenses we purchase due to budgeting."

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

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

"We have a license to use this solution. We have an E3 license which covers many different solutions."

"For the moment, we are paying on a monthly basis because we are still adapting the support and how we want to proceed. I think we will move to paying for the annual license."

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

"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."

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

More Office 365 pricing and cost advice

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

"The solution’s pricing is cheap."

"The solution is cheap in my country."

"We use the free version that does not have a license."

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

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

"The solution is expensive."

"It is an affordable solution."

More Slack pricing and cost advice

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Top Industries

By visitors reading reviews

Educational Organization

77%

Computer Software Company

Financial Services Firm

Government

Educational Organization

78%

Computer Software Company

Financial Services Firm

University

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?

I am not aware of the cost at work, but the cost for personal use has increased significantly and feels expensive.

What needs improvement with Office 365?

Moving from the original Outlook to Outlook 365 was problematic because I couldn't transfer a lot of my previous emails. This is an area where improvement is needed to make the transition smoother....

What is your primary use case for Office 365?

I use Office 365 ( /products/office-365-reviews ) strictly for sales. As a small office, we utilize products like Outlook and Word.

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...

Google Workspace vs Office 365

Comparisons

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Amazon WorkDocs vs Office 365

Compared 11% of the time

Atlassian Confluence vs Office 365

Compared 8% of the time

Box vs Office 365

Compared 7% of the time

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Symphony vs Slack

Compared 17% of the time

Chatter vs Slack

Compared 14% of the time

Atlassian Confluence vs Slack

Compared 12% of the time

ChatWork vs Slack

Compared 11% 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