The 15 Best Microsoft Outlook Add-ins You Didn't Know You Needed

The right Outlook add-in depends on what you need from your inbox: faster drafting, cleaner filing, tighter collaboration, or safer sending.

This guide compares 15 useful Microsoft Outlook add-ins across productivity, collaboration, security, and lighter internal comms - with practical notes on where each one fits.

Contents

• Outlook Add-Ins for Productivity
• Outlook Add-Ins for Collaboration
• Outlook Add-Ins for Security
• Outlook Add-Ins for Fun

Before you install anything, decide whether you need help with day-to-day inbox work, team coordination, or protecting sensitive messages. Most firms use a small mix rather than one add-in for everything.

At a Glance

The table below summarises the add-ins covered in this guide. Check each provider's site for current features, permissions, and pricing before you install.

Use the detailed sections below when you need more context on setup, trade-offs, and where each add-in fits day to day.

Before installing, check permissions, platform support, and whether the add-in will be used by one person or rolled out team-wide.

The productivity add-ins below are useful when drafting, filing, signing, or organising messages takes more time than the work itself.

The Best Outlook Add-Ins for Productivity

1. Grammarly - The Best Outlook Add-In for Spell-Check

Free your emails from easily overlooked mistakes.

Grammarly is an AI-powered writing assistant that helps make sure communications are accurate and clear before they leave your inbox.

You may already use Grammarly elsewhere but might not know it also offers an Outlook add-in.

Installing the add-in lets you check spelling, grammar, punctuation, and tone directly in email drafts.

• Pro: Suggests alternative phrasing as well as basic grammar and spelling checks.
• Con: AI suggestions still need human review, especially for regulated or client-facing wording.

Pricing: Free tier available; paid plans on Grammarly's site.

2. Boomerang - The Best Outlook Add-In for Email Delays

Schedule emails to be sent at a later time or date.

Outlook already supports scheduled sending, but Boomerang adds send-later controls, open tracking, and availability sharing in one add-in.

You can insert tracking links to see whether messages have been opened.

It also helps you share meeting availability without leaving the compose window.

• Pro: Useful when you write messages outside recipient time zones or want to batch outbound email.
• Con: The interface takes a short learning curve if you only need basic send-later behaviour.

Pricing: Free tier available; paid plans on Boomerang's site.

3. SimplyFile - The Best Outlook Add-In for Organisation

Clean and organise your email inbox.

SimplyFile uses AI to learn filing habits and move messages into folders with one-click shortcuts.

It also supports thread cleanup, inbox task creation, and send delays.

• Pro: Can cut manual filing time for high-volume inboxes.
• Con: Predictive filing is not always right first time, so folders still need occasional review.

Pricing: Paid plans on SimplyFile's site.

4. Evercontact - The Best Outlook Add-In for Contact Creation

Automatically create and update contacts.

When an email arrives, Evercontact extracts details from the sender's signature to update or create address book entries.

It also offers ContactRescue, a one-off service that can recover contact details from archived messages.

• Pro: Shared contact updates can help teams keep address books current.
• Con: Device limits apply depending on plan and account setup.

Pricing: Paid plans on Evercontact's site.

5. Shared Email Templates - The Best Outlook Add-In for Templated Messages

Create custom templates for your emails.

Shared Email Templates gives you pre-made and custom snippets for common replies you send repeatedly.

You can organise snippets by category or favourites and search quickly from the compose pane.

Templates can also be shared with colleagues.

• Pro: Works for meeting and appointment responses as well as standard email replies.
• Con: Teams still need a habit of using snippets rather than retyping familiar answers.

Pricing: Free tier available; paid plans on Microsoft AppSource.

6. DocuSign - The Best Outlook Add-In for E-Signatures

Sign and return documents from Outlook.

DocuSign lets you send documents for signature without printing, scanning, or switching apps.

Connecting DocuSign with Microsoft 365 can also save signed files to OneDrive when configured.

• Pro: Removes print-sign-scan loops for agreements and approvals sent by email.
• Con: The task pane can feel busy until you know where common actions live.

Pricing: Paid plans on DocuSign's site.

7. ClearContext - The Best Outlook Add-In for Reducing Inbox Clutter

Keep a cleaner, more organised inbox.

ClearContext helps you file messages in bulk, track responses, and group email, tasks, and appointments into project-based views.

• Pro: One-click filing can speed up high-volume inbox cleanup.
• Con: Project setup takes time before the workflow pays off.

Pricing: See current plans on ClearContext's site.

8. Trello - The Best Outlook Add-In for Team Collaboration

Connect board work to your calendar view.

Trello is a common choice for teams that want card-based task visibility without leaving email entirely.

The Outlook add-in lets you connect board calendars so due dates and tasks appear alongside your schedule.

• Pro: Helpful when email threads regularly turn into tracked tasks.
• Con: Calendar sync may lag behind board changes in Trello.

Pricing: Free tier available; paid plans on Atlassian's site.

9. Evernote - The Best Outlook Add-In for Sticky Notes And To-Do Lists

Turn email into notes and tasks.

Evernote for Outlook lets you save messages as notes, share email into notebooks, and attach notes to outgoing messages.

• Pro: Useful when email is your intake route for research, follow-ups, and project notes.
• Con: Full functionality depends on an active Evernote account.

Pricing: Free tier available; paid plans on Evernote's help centre.

10. Custom Signatures - Another Great Outlook Add-In for Personalised Signatures

Set up independent signatures for different recipients and accounts.

Custom Signatures supports multiple signatures for different accounts and recipients, including plain text and HTML formats.

• Pro: Helpful when one person sends from several mailboxes or roles.
• Con: The task pane may show sponsored content in the free version.

Pricing: Free

The Best Outlook Add-Ins for Collaboration

1. Zoom - The Best Outlook Add-In for Easy Virtual Meetings

Add a Zoom meeting to any Outlook calendar event.

The Zoom add-in inserts meeting links and dial-in details into new or existing Outlook calendar events.

That saves switching between calendar compose and your meeting platform when booking calls.

• Pro: Works well for teams that already standardise on Zoom for external meetings.
• Con: Some users report issues for Mac recipients receiving certain calendar invitations.

Pricing: Requires an active Zoom subscription; see Zoom on AppSource and Zoom's pricing pages.

2. MeisterTask - The Best Outlook Add-In for Task Management

Turn work that arrives by email into structured tasks.

MeisterTask helps teams capture requests from email and convert them into tracked tasks inside a shared board.

The Outlook add-in is useful when inbox messages regularly become assignments with owners and due dates.

• Pro: Straightforward capture flow from message to task.
• Con: The free tier limits how much workflow automation you can use.

Pricing: Free tier available; paid plans on Microsoft AppSource.

The Best Outlook Add-Ins for Security

Security add-ins matter most when email carries client records, financial documents, identity checks, or other sensitive information. Productivity tools can speed up drafting; security tools help control who can open a message and what evidence exists afterwards.

For regulated teams, secure sending usually needs more than folder protection alone.

1. Mailock - The Best Outlook Add-In for Secure Email

Send sensitive email with encryption and recipient checks.

Mailock is our secure email platform for individuals, teams, and enterprises that need to send sensitive information by email without forcing recipients into a new portal.

The Mailock Outlook add-in adds AES-256 encryption, recipient authentication, secure replies, Message Revoke, and message tracking from the compose window.

That helps regulated teams keep email as the delivery route while adding controls around access, replies, and delivery records.

• Pro: Helps reduce misdelivery risk with revoke, authentication, and audit-friendly message records.
• Con: The Outlook add-in is available on Windows desktop; Mailock can also be used via the web app.

Pricing: Free plan available; paid plans and current limits on Mailock pricing.

"In my 40 years in digital security, I've seen how a single lapse in email security can have devastating consequences.

Protecting your communications from interception is essential."

Paul Holland, Founder and CEO, Beyond Encryption (Mailock)

From an operations perspective, the add-in also needs to fit how teams already compose and send mail.

"Outlook is where many sensitive messages are written, so security controls need to sit inside that workflow rather than somewhere else.

An add-in only helps if your team can send securely without breaking the way they already work."

Adam Byford, COO, Beyond Encryption (Mailock)

If your team sends client documents, advice packs, or identity-related information from Outlook, it is worth checking how your current setup handles authentication, secure replies, and delivery records.

Folder protection add-ins can also help teams that rely on shared mailboxes and strict filing rules.

2. MAPILab Folder Guard - The Best Outlook Add-In for Preventing Filing Accidents

Get alerts about risky Outlook folder actions.

Accidental folder moves and deletions are a common Outlook problem, especially in shared mailboxes.

MAPILab Folder Guard adds permissions and warnings when users try to modify, delete, or move protected folders.

• Pro: Customisable folder protection for teams with strict filing rules.
• Con: Setup is more involved than basic undo or archive habits.

Pricing: Free trial available; see current licence pricing on MAPILab's site.

The Best Outlook Add-Ins for Fun

GIPHY - The Best Outlook Add-In for GIFs

Find GIFs and stickers for your messages.

GIPHY lets you search trending GIFs and stickers and insert them directly into Outlook messages.

• Pro: Quick to use for informal internal updates or lighter client relationships.
• Con: Best kept out of formal regulated or complaint-handling threads.

Pricing: Free

Choosing the Best Outlook Add-Ins for Your Team

The best Microsoft Outlook add-ins are the ones that match a real workflow problem: drafting quality, inbox filing, meeting coordination, or secure sending.

Start with one or two add-ins, confirm permissions with IT where needed, and check each vendor's current documentation before rollout.

For sensitive client communication, compare security add-ins on recipient authentication, revoke options, and delivery records as well as encryption.

FAQs

What Are Outlook Add-Ins, and How Do They Work?

Outlook add-ins are small programs that extend Outlook with tools for productivity, organisation, collaboration, and security.

They can be installed via Microsoft AppSource or a developer's site.

Are Outlook Add-Ins Safe to Use?

Most add-ins are safer when downloaded from trusted sources such as Microsoft AppSource.

Review permissions, limit installs to what your team actually needs, and align choices with IT and data protection policies.

Is There a Free AI Add-In for Outlook?

Yes. Grammarly and Boomerang both offer free tiers with AI-assisted or scheduling features, though advanced capability usually requires a paid plan.

How Do I Add an Add-In to Outlook?

Click "Get Add-ins" in the Outlook toolbar, search in Microsoft AppSource, and select "Add" or "Get It Now".

Follow the setup instructions shown for your Outlook version.

What Is the Best Way to Organise Emails in Outlook?

Use filing add-ins such as SimplyFile or ClearContext alongside Outlook rules, folders, and regular archive cleanup.

The best approach depends on message volume and whether one inbox or shared mailboxes need the same structure.

Are All Outlook Add-Ins Free?

No. Many tools offer a free tier, but advanced features or business use usually require a paid subscription.

Check each provider's current pricing page before you standardise on an add-in.

References

Microsoft AppSource, Microsoft, 2026

Grammarly for Microsoft Office, Grammarly, 2026

Boomerang for Outlook, Boomerang, 2026

SimplyFile for Outlook, TechHit, 2026

Evercontact for Outlook, Evercontact, 2026

ClearContext for Outlook, ClearContext, 2026

DocuSign for Microsoft Outlook, DocuSign, 2026

Trello add-in for Outlook, Atlassian, 2026

How to use Evernote for Outlook, Evernote, 2026

MeisterTask for Outlook, MeisterTask, 2026

Zoom for Outlook, Zoom, 2026

Shared Email Templates for Outlook, Microsoft, 2026

GIPHY for Outlook, Microsoft, 2026

MAPILab Folder Guard for Outlook, MAPILab, 2026

Mailock pricing, Mailock, 2026

Mailock for Outlook, Mailock, 2026

Develop Outlook Add-ins for the New Outlook on Windows, Microsoft Learn, 2026

Feature Comparison Between New Outlook and Classic Outlook, Microsoft Support, 2026

Reviewed by

Sam Kendall, 29.05.26

This content is for general information only and is not legal advice.