Office 365 vs Slack comparison

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Office 365

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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).

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Office 365 vs. Slack

April 2025

Helped 845,849 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

8.4

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

"Adaptable solution with a good interface. It's easy to set up and easy to use."

"The cloud service and Skype are the most valuable features."

"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 most valuable feature is the integration with OneDrive, which has allowed us, a small business, easy access to a cloud environment, with no need to back up the data from five different computers."

"The most valuable feature of Office 365 is automatic saving. If something happens on the computer your work is saved."

"The phone VoIP product provides genuine a unified communication solution."

"Great impact on project management and team collaboration."

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

More Office 365 pros

"Slack is a really easy collaboration tool to use and many companies are adopting this popular tool."

"It has definitively made an improvement on our productivity. Information does not got lost in hundreds of less important messages."

"I am impressed with the product's calls and screen share features which are very useful."

"Its intuitive design makes it easy to use and understand, hence we do not have a need to spend much on educating our teams."

"Slack helps me to read bulk messages."

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

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

"The solution is scalable."

More Slack pros

Cons

"We have found that, with Teams, if you are including one more person who is not in the company ecosystem, supposedly I'm inviting them as a guest in the chat. However, when I do that, I can't share files."

"I would like to see the macro functionality in Excel made simpler."

"Could include integration with other single sign-on solutions."

"Integration between Outlook calendar and Google Calendar would be a good improvement since many of our team use Android phones and personal Gmail accounts as their main calendar application."

"Integration with other platforms can be improved."

"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."

"There are some complexities to the initial setup if you use some of the more advanced features."

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

More Office 365 cons

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

"The only area of concern that I have is with the inability to preview received documents without having to download them first."

"I think Slack could add additional features without making the solution slower or more difficult to use."

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

"I want a feature in the solution that will help me share documents only with the set of people that I prefer rather than all of them. I would also like the solution to have a feature similar to Microsoft SharePoint where you can group all your documents."

"Slack could add additional and better integrations."

"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."

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

More Slack cons

Pricing and Cost Advice

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

"The price of Office 365 is very expensive."

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

"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."

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

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

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

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

More Office 365 pricing and cost advice

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

"Slack is definitely worth the money."

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

"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."

"It is an affordable solution."

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

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

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

More Slack pricing and cost advice

See which vendors are best for you

Use our free recommendation engine to learn which Content Collaboration Platforms solutions are best for your needs.

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Top Industries

By visitors reading reviews

Educational Organization

81%

Computer Software Company

Financial Services Firm

Government

Educational Organization

84%

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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Product Reports

Download Office 365 product report

Office 365

March 2025

Download Slack product report

March 2025

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