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: March 2020).

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Office 365 vs. Slack

March 2020

Helped 837,501 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 4.9%, down 6.9% compared to last year.
Slack, on the other hand, focuses on Enterprise Social Software, holds 12.5% mindshare, up 9.8% 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

"Great impact on project management and team collaboration."

"I like all of the features."

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

"The functionality that is most valuable is the solution's ability to detect patient data in email attachments. Whenever a user sends out an email with patient data embedded in an attachment, it triggers an alert. The tool can detect a social security number and various other forms of patient identity. Emails are then automatically generated and sent."

"If you have a global solution, you can go from one product to the other very easily. And then you can share data between all the different tools of Office which is good because participation and sharing is very good. That's the most important aspect of Office 365."

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

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

"We use it for documentation management, to collaborate with Microsoft Teams, web calls, web conference calls, chats, and as a documentation repository mainly. We have an Office pack suite to be able to write documentation, make spreadsheets, and create PowerPoints."

More Office 365 pros

"Slack makes it easy for employees to contact each other and exchange documents or information."

"In terms of setup, approaching its menu is simple."

"Slack is a very stable product."

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

"The solution is scalable."

"The solution's most valuable feature is the search functionality, which I can use to search for full text."

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

"Its integration with different apps is a great feature."

More Slack pros

Cons

"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."

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

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

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

"The feature to convert PDF file to a Word document needs improvement as well as the feature to save the file automatically when typing, without using the save command."

"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."

"Using Office 365 is not that flexible on some mobile devices, like Android."

"Office 365 could allow for smoother collaboration with other companies, which is the main reason we use it. The B2B connection is something we need, like global adverse lists between two tenants or multiple users. That's what we're missing at the moment."

More Office 365 cons

"The solution's user interface is not very good and changes very often."

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

"The UI could be a little bit better."

"The notifications on the phone are delayed."

"We do experience issues when trying to log in on Slack."

"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."

"For me, the only thing I can say is that every time somebody sent me an attachment, the attachment was listed somewhere, and then I had to open the conversation and go to the individual to open it. So there is no handy repository or an easy way to quickly look at attachments. For me, that was a bit difficult."

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

More Slack cons

Pricing and Cost Advice

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

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

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

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

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

"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."

"The pricing/licensing is easy to manage."

More Office 365 pricing and cost advice

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

"The solution is expensive."

"It is less expensive than one of its competitors."

"The tool's pricing could be cheaper."

"The solution is cheap in my country."

"It is an affordable solution."

"The solution’s pricing is cheap."

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

84%

Computer Software Company

Financial Services Firm

Government

Educational Organization

86%

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?

The pricing is reasonable. While cheaper would be better, we are generally satisfied with the current pricing model.

What needs improvement with Slack?

Slack's Canvas feature could be improved in terms of its user experience. While they are trying to integrate something like Notion, it doesn't work well, which is why we still use Notion for offici...

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Product Reports

Download Office 365 product report

Office 365

February 2025

Download Slack product report

January 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