The top Outlook Add-ins for Office 365

The top Outlook Add-ins for Office 365 – as rated by users

Office 365 Add-ins for Outlook are rapidly becoming the go-to integration technology for SAAS platforms which need to integrate with Outlook. In a little over three years over 400 significant SAAS products have integrated their systems using Add-in technology.

Who are publishing Add-ins?

The list of Add-in publishers reads like a who’s who of SAAS applications. SalesForce, Hubspot, Evernote, Trello… the list goes on – with many popular, high rated Add-ins published by names we all know. But it also includes a number of lesser known or newer SAAS applications taking advantage of the integration benefits for their users.

What are Add-ins?

Office 365 Add-ins let you integrate Outlook with other applications. Add-ins differ from the older ‘Plugin’ technology in several significant ways.

  • Office 365 Add-ins operate in all Outlook client technologies including Outlook for Mac, Outlook Web Access (Browser) and Mobile versions of Outlook.
  • Office 365 Add-ins utilise web technologies such as HTML and JavaScript
  • Office 365 Add-ins are not installed on a local machine – but are ‘attached’ to the user’s Mailbox – meaning installation and support is much simpler.

Add-ins can be quickly found and installed by a user or administrator from the Microsoft store. Versions of Outlook which can utilise Add-ins have a store icon in their ribbon, so finding and installing Add-ins takes only a few clicks.

Given the advantages, its not surprising that SAAS businesses are seeing the benefits and developing integrations based on Add-ins.

Top Add-ins for Outlook

We analysed the Microsoft Office Store in April 2018, and used the results to rank Add-ins for Outlook based on users ratings, and the number of reviews. So our Top add-ins have a combination of high ratings and lots of reviews.

In the Microsoft Store, ratings are a scored out of 5 by the users when they leave a review. There were no add-ins with more than 100 reviews with an average rating less than 3 (or higher than 4).

So here are all the Add-ins for Outlook which had achieved over 100 reviews when we did the initial survey (April 2018):

#16 Officeatwork Mail Responder for Outlook

Score: 408               Rating: 4              Ratings: 102        Publisher: officeatwork 365

Officeatwork 365 Mail Responder offers an easy process to each employee to quickly design auto response messages using streamlined workflow style input methods that make sure automatic response messages are complete, polite, thoughtful and consistent throughout the company.

User Benefits: It makes life easier for each individual user by surfacing this auto response feature of Exchange in a more discoverable way and by providing boiler plated templates for the most common scenarios for a user to capture their auto response messages in up to three different languages with just a few clicks. The UI is mobility-optimized and works on all devices and form factors.

Organization Benefits: Auto response messages are more likely to be activated helping in actively managing expectations of employees, customers and partners. Auto response messages are complete, polite, thoughtful and consistent, adding/retaining to the trust level associated with their brand/organization.



Score: 434           Rating: 3.5           Ratings: 124        Publisher: Giphy

Search, discover, and insert GIFs into your emails. Bring the power of a GIF search engine right into Outlook, and respond to emails with GIFs seamlessly. Browse our curated list of trending GIFs every day or search from dozens of hand-picked categories such as reaction GIFs, celebrity GIFs, mood GIFs, etc.

To use the GIPHY Add-in, simply search for a GIF and click on a result to insert it directly into your email. Note: This Add-in may contain content not appropriate for children under age 13.


#14 PayPal for Outlook

Score: 468             Rating: 4               Ratings: 117        Publisher: PayPal Inc.

Get PayPal for Outlook and start sending money the safer, more secure way… right from your email.

Just open the PayPal app inside Outlook, choose a friend, and send the money using the email address Outlook auto-fills for us. When it comes to paying people back, it’s the sure-fire way to avoid being “that friend.”


#13 DocuSign for Outlook

Score: 516           Rating: 4               Ratings: 129        Publisher: DocuSign, Inc.

Enhance productivity by signing or sending any document from Microsoft Outlook

Sign and return or get signatures on documents sent to you in seconds with DocuSign for Outlook! With this newest release, you can now access the DocuSign for Outlook add-in directly from the ribbon – allowing you to request signatures or sign and return critical documents in seconds.

Once installed, DocuSign for Outlook will appear in the Outlook toolbar whenever an attachment is found on an email message. If you are the signer, DocuSign for Outlook will walk you through the process of signing and returning the document. If you need signatures from others, the add-in will guide you to define recipients and tag the documents to gather information from those specified.

The DocuSign for Outlook add-in increases your productivity and enables individuals and organizations to legally and securely sign and return, or get signatures on email attachments, without ever having to leave their Inbox. There’s no need to print, scan, or fax again!

This add-in is free to download and includes a free trial (i.e., 5 free document sends with a Microsoft account and 10 free document sends with an Office 365 account).


#12 Email Recovery

Score: 597             Rating: 3               Ratings: 199        Publisher: Brad Hughes

Helps recover deleted email messages from purges and deletions

The Email Recovery Outlook add-in assists users in recovering previously deleted email messages from the purges and deletions folders.


#11 Smartsheet for Outlook

Score: 598.5           Rating: 3.5           Ratings: 171        Publisher:, Inc.

Turn email into action – move emails and attachments to Smartsheet without leaving Outlook

The Smartsheet for Outlook integration allows you to create or edit items in Smartsheet and collaborate in real-time, all without leaving your inbox. Put nearly anything you want in Smartsheet – project tasks, change requests, resumes, customer requirements, and more. Unclog your email and keep track of every detail with ease when you pair Smartsheet and Outlook together.

Key features include:

  • Convert any email into a shared item that instantly appears as a row in your Smartsheet project or sheet for all collaborators to see and act upon.
  • Create or edit a Smartsheet item then assign it to someone, schedule it, or add comments and other relevant details contained in your email.
  • Keep the entire email as a discussion associated with your Smartsheet item.
  • Search or browse Smartsheet for the right sheet or project.
  • Add all or selected email attachments to your Smartsheet item.


#10 FindTime

Score: 700             Rating: 4               Ratings: 175        Publisher: Microsoft Corporation

Discover the easiest way to find time to meet.

FindTime is an add-in for Outlook that helps you come to consensus on a meeting time. Have you ever spent more time deciding when to meet than actually meeting? FindTime shows what days and times work the best for people within your organization. Propose your selected times to all attendees and allow everyone to vote. Once you reach consensus, FindTime sends out the meeting invite on your behalf, eliminating the time consuming back-and-forth usually required to find the best meeting time.


#9 Trello

Score: 792             Rating: 4               Ratings: 198        Publisher: Trello

Quickly create new cards on your Trello boards without leaving your inbox.

Turn email into actionable items and keep your team on track with Trello for Outlook. Create cards, input descriptions, and add due dates directly from Outlook, and make sure important emails never fall through the cracks.


#8 Message Header Analyzer

Score: 852             Rating: 4               Ratings: 213        Publisher: Stephen Griffin

Analyze the headers on an email message.

Message Header Analyzer uses EWS and REST to retrieve the transport message headers of an e-mail message and display them to the user in an easy to read format. Now with iOS support!


#7 HubSpot Sales

Score: 1148             Rating: 4               Ratings: 287        Publisher: Hubspot

Organize leads, track email opens and clicks, and send email templates all in one place.

HubSpot Sales helps you uncover more leads in less time, connect with those leads, and close deals faster while managing all your contacts in one central database. And it’s 100% free to get started.

Track emails through Outlook and get notified the instant a prospect opens an email, clicks a link, or opens an attachment for a timely, relevant follow up.

Turn repetitive emails into templates, measure their performance, and share the best ones with your entire team. Access all your templates directly in Outlook.

Queue up a sequence of personalized follow-up emails and reminders that get delivered automatically. Enroll contacts into a sequence right in Outlook window.

Eliminate back and forth emails and missed calls by sending a link that lets your leads pick a time that works for both of you.

Eliminate manual entry as every lead’s contact info, email opens, and clicks get logged automatically.

HubSpot Sales comes pre-packaged with HubSpot CRM Free, allowing you to manage your entire pipeline and speed up your sales process without clunky tools or spreadsheets.


#6 Emojis

Score: 1242.5             Rating: 3.5           Ratings: 355        Publisher: UpdateStar GmbH

Add emoji to emails

Adds an emoji task pane to Outlook (desktop and web) using the awesome EmojiOne emoji set. Features:

  • History
  • Categories
  • Select preferred skin tone
  • Search based on names and keywords
  • Works for HTML and text only emails


#5 Wunderlist for Outlook

Score: 1442             Rating: 3.5           Ratings: 412        Publisher: Wunderlist

Organize your Inbox. Save emails as tasks in your Wunderlist, where you can track & organize them.

Keeping your inbox organized is a whole lot easier with Wunderlist for Outlook. Whenever you get an email that’s more task than correspondence, simply add it straight to your Wunderlist.

Turn Emails into Tasks

Once you’ve added Wunderlist for Outlook, you’ll find it at the top of any email message. Simply click on the add-in and we’ll make the subject of your email the task name, and the body of the email as a note. Before clicking ‘Add to Wunderlist’ you can set a reminder and choose which list to send it to.

Share a List When you Send an Email

Whether you’re starting a new project or simply need to keep your team in the loop, it’s easy to share your lists with Wunderlist for Outlook. Get started by creating a new email, then click the ‘Wunderlist’ button, pick a list to share and you’re done.


#4 Evernote

Score: 1800             Rating: 4               Ratings: 450        Publisher: Evernote

Tame your inbox. Save important email to a workspace where ideas go from projects to completion.

Important project communication gets lost in a crowded inbox. With Evernote, add the power of Evernote right into your email composer. Save emails from Outlook to Evernote and organize them with the rest of the project, or quickly add notes from Evernote to any Outlook email to share them with others.

Never lose an email again. Organize important email by clipping any Outlook thread and its attachments to Evernote. Save and access it from all the devices where Evernote is installed.

Organize emails in notebooks. Send emails directly to your project notebooks so you can keep all the moving parts together.

Attach Evernote notes to email. Add Evernote right into your Outlook email composer. Give your recipients the greater context of your Evernote notes and documents by adding them to the email as beautiful snippets. Great for sharing tasks, articles, and projects.


#3 Translator for Outlook

Score: 1862             Rating: 3.5           Ratings: 532        Publisher: Microsoft Corporation

Translator helps you read messages in your preferred language across devices.

Translator provides you with a simple way to translate and read messages in your preferred language, across devices.

Install once and use across devices. Enable Translator once, and use across all your devices, with Outlook for iOS, Mac, Windows, Office 365 & (Coming soon to Android.)

Translate seamlessly. Don’t switch between apps to get a translation; see a fully translated view of the message with a tap of a button.


#2 Boomerang

Score: 2509.5             Rating: 3.5           Ratings: 717        Publisher: Baydin Inc.

The ultimate email productivity tool. Send later, track responses, schedule meetings, and more!

Boomerang lets you schedule emails to send later, helps you follow up on messages that don’t get a reply, and makes scheduling meetings a snap! You can snooze an email to have it reappear later, or share real-time availability with contacts in a few easy clicks.

Boomerang includes Respondable, an AI assistant that helps you write better emails, backed by data from millions of emails, and Inbox Pause, which halts incoming emails while you focus on the task at hand.


#1 Salesforce Lightning for Outlook

Score: 3104.5             Rating: 3.5           Ratings: 887        Publisher:

Salesforce Lightning for Outlook lets you experience Salesforce right in Outlook. It is 100% cloud based with no software to push, install, or maintain.

View all contacts, leads, accounts, opportunities, cases, and custom objects associated to emails and appointments without switching between Salesforce and Outlook; your Salesforce data appears directly in Outlook.

Search and browse Salesforce records inside Outlook. Easily create new Salesforce records, including Custom Object records. Add emails and appointments to Salesforce records in one click, even when composing emails.

Quickly craft emails with Salesforce Templates. Manage Salesforce Tasks right from Outlook. Sync contacts and calendar events by enabling Lightning Sync in addition to Lightning for Outlook.

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Click here to get a list of the top 150 Add-ins as an Excel spreadsheet.

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