# Thunderbird, eM Client vs Microsoft Outlook Comparison | | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Star Rating** | 4.3 out of 5 | 4.0 out of 5 | 4.5 out of 5 | | **Total Reviews** | 339 | 61 | 3,479 | | **Largest Market Segment** | Small-Business (65.1% of reviews) | Small-Business (46.4% of reviews) | Enterprise (38.1% of reviews) | | **Entry Level Price** | No pricing available | FREE for Individuals | No pricing available | --- ## Top Pros & Cons ### Thunderbird Pros: - Functionality Features (4 reviews) - Ease of Use (3 reviews) Cons: - Difficult Setup (2 reviews) - Missing Features (2 reviews) ### eM Client Pros: - Ease of Use (2 reviews) - User Interface (2 reviews) Cons: - Lack of Integration (1 reviews) - Missing Features (1 reviews) ### Microsoft Outlook Pros: - Ease of Use (227 reviews) - Calendar Integration (125 reviews) Cons: - Slow Loading (84 reviews) - Slow Performance (82 reviews) --- ## Ratings Comparison | Rating | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Meets Requirements** | 8.7 (304 reviews) | 8.5 (48 reviews) | 9.2 (2728 reviews) | | **Ease of Use** | 8.7 (305 reviews) | 8.8 (50 reviews) | 9.0 (2812 reviews) | | **Ease of Setup** | 8.8 (75 reviews) | 9.5 (10 reviews) | 9.1 (986 reviews) | | **Ease of Admin** | 8.4 (58 reviews) | 8.1 (7 reviews) | 8.6 (319 reviews) | | **Quality of Support** | 7.9 (222 reviews) | 7.8 (42 reviews) | 8.6 (2224 reviews) | | **Has the product been a good partner in doing business?** | 8.1 (41 reviews) | 7.8 (6 reviews) | 8.8 (300 reviews) | | **Product Direction (% positive)** | 7.6 (302 reviews) | 9.0 (46 reviews) | 8.5 (2652 reviews) | --- ## Pricing ### Thunderbird #### Entry-Level Pricing No pricing available #### Free Trial No information available ### eM Client #### Entry-Level Pricing Plan: eM Client Free License Price: FREE for Individuals Description: Download the Free version of eM Client with limited functionality. Key Features: - Non-commercial use only - Max. 2 email accounts - Email, Calendar and Task management [Browse all 3 editions](https://www.g2.com/products/em-client/pricing) #### Free Trial Yes ### Microsoft Outlook #### Entry-Level Pricing No pricing available #### Free Trial No information available --- ## Features Comparison By Category ### Email Client | Product | Score | Reviews | |---|---|---| | **Thunderbird** | 8.5/10 | 123 | | **eM Client** | 8.5/10 | 23 | | **Microsoft Outlook** | 8.8/10 | 1298 | #### Inbox Tools | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Unified Inbox** | 8.9 (104 reviews) | 8.5 (20 reviews) | 9.1 (1090 reviews) | | **Filters** | 8.9 (109 reviews) | 8.8 (21 reviews) | 8.9 (1163 reviews) | | **Reminders** | 8.5 (96 reviews) | 8.3 (20 reviews) | 9.3 (1168 reviews) | | **Notifications** | 8.7 (104 reviews) | 8.3 (20 reviews) | 9.2 (1174 reviews) | #### Coordination Tools | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Calendar** | 8.4 (93 reviews) | 8.8 (22 reviews) | 9.3 (1190 reviews) | | **Contacts** | 8.6 (101 reviews) | 8.3 (21 reviews) | 8.9 (1142 reviews) | | **Task Management** | 8.4 (89 reviews) | 8.3 (17 reviews) | 8.8 (1085 reviews) | #### Software Options | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Desktop Application** | 9.2 (111 reviews) | 8.9 (22 reviews) | 9.2 (1157 reviews) | | **Mobile Application** | 7.6 (64 reviews) | Feature Not Available | 8.7 (1106 reviews) | #### Email Client - Agentic AI | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Autonomous Task Execution** | Not enough data | Not enough data | 7.5 (112 reviews) | | **Cross-system Integration** | 8.0 (5 reviews) | Not enough data | 7.8 (118 reviews) | ### Calendar | Product | Score | Reviews | |---|---|---| | **Thunderbird** | N/A | N/A | | **eM Client** | N/A | N/A | | **Microsoft Outlook** | 8.5/10 | 1477 | #### Calendar View | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Multi-Calendar View** | Not enough data | Not enough data | 9.0 (1222 reviews) | | **Customizable Viewing** | Not enough data | Not enough data | 8.9 (1235 reviews) | #### Shared Calendar | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Calendar Collaboration** | Not enough data | Not enough data | 9.0 (1235 reviews) | | **Multiple Calendar Management** | Not enough data | Not enough data | 8.9 (1181 reviews) | #### Accessibility | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Screen Reader Compatibility** | Not enough data | Not enough data | 8.8 (1057 reviews) | | **Keyboard Shortcuts** | Not enough data | Not enough data | 8.6 (1077 reviews) | #### Integration | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Sync Multiple Calendars** | Not enough data | Not enough data | 8.8 (1135 reviews) | | **Import Events** | Not enough data | Not enough data | 8.8 (1139 reviews) | | **Software Integrations** | Not enough data | Not enough data | 8.9 (1235 reviews) | #### Notifications | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Customized Calendar Notifications** | Not enough data | Not enough data | 9.0 (1179 reviews) | | **Location-Based Alerts** | Not enough data | Not enough data | 8.5 (970 reviews) | #### Generative AI | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **AI Text-to-Image** | Not enough data | Not enough data | 7.4 (420 reviews) | | **AI Text-to-Speech** | Not enough data | Not enough data | 7.5 (421 reviews) | | **AI Image-to-Text** | Not enough data | Not enough data | 7.3 (420 reviews) | #### Agentic AI - Calendar | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Cross-system Integration** | Not enough data | Not enough data | 7.7 (165 reviews) | ### Email Management | Product | Score | Reviews | |---|---|---| | **Thunderbird** | 8.9/10 | 9 | | **eM Client** | N/A | N/A | | **Microsoft Outlook** | N/A | N/A | #### Sorting & Filtering | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Attachment Search** | 9.2 (6 reviews) | Not enough data | Not enough data | | **Tags** | 10.0 (7 reviews) | Not enough data | Not enough data | | **AI Sorting** | 8.0 (5 reviews) | Not enough data | Not enough data | | **Predefined Rules** | 9.2 (6 reviews) | Not enough data | Not enough data | #### Integrations | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Microsoft Outlook Integration** | 8.3 (6 reviews) | Not enough data | Not enough data | | **Gmail Integration** | 9.0 (7 reviews) | Not enough data | Not enough data | | **Apple Calendar Integration** | 8.1 (6 reviews) | Not enough data | Not enough data | #### Time Management | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Unified Inbox** | 9.4 (6 reviews) | Not enough data | Not enough data | | **Email Automation** | 8.8 (7 reviews) | Not enough data | Not enough data | | **Snooze** | 9.0 (5 reviews) | Not enough data | Not enough data | #### Generative AI | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **AI Text Generation** | Not enough data | Not enough data | Not enough data | | **AI Text-to-Speech** | Not enough data | Not enough data | Not enough data | | **AI Text Summarization** | Not enough data | Not enough data | Not enough data | #### Agentic AI - Email Management | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Autonomous Task Execution** | Not enough data | Not enough data | Not enough data | | **Cross-system Integration** | Not enough data | Not enough data | Not enough data | ### Email | Product | Score | Reviews | |---|---|---| | **Thunderbird** | N/A | N/A | | **eM Client** | N/A | N/A | | **Microsoft Outlook** | 8.0/10 | 503 | #### Generative AI | Feature | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **AI Text Generation** | Not enough data | Not enough data | 7.8 (464 reviews) | | **AI Text Summarization** | Not enough data | Not enough data | 7.9 (459 reviews) | | **AI Text-to-Speech** | Not enough data | Not enough data | 7.7 (452 reviews) | | **Autonomous Task Execution** | Not enough data | Not enough data | 7.9 (140 reviews) | | **Cross-system Integration** | Not enough data | Not enough data | 8.3 (150 reviews) | | **Proactive Assistance** | Not enough data | Not enough data | 8.1 (141 reviews) | --- ## Categories **Shared Categories (1):** [Email Client Software](https://www.g2.com/categories/email-client) **Unique to Thunderbird (1):** [Email Management Software](https://www.g2.com/categories/email-management) **Unique to Microsoft Outlook (2):** [Calendar Software](https://www.g2.com/categories/calendar-software), [Email Software](https://www.g2.com/categories/email) --- ## Reviewer Demographics ### By Company Size | Segment | Thunderbird | eM Client | Microsoft Outlook | |---|---|---|---| | **Small-Business** | 65.1% | 46.4% | 25.2% | | **Mid-Market** | 24.4% | 35.7% | 36.6% | | **Enterprise** | 10.5% | 17.9% | 38.1% | ### By Industry #### Thunderbird - **Information Technology and Services:** 13.0% - **Computer Software:** 11.7% - **Internet:** 6.6% - **Marketing and Advertising:** 5.1% - **Telecommunications:** 3.3% - **Higher Education:** 2.7% - **Consumer Goods:** 2.4% - **Design:** 2.4% - **Education Management:** 2.1% - **Renewables & Environment:** 2.1% - **Other:** 48.5% #### eM Client - **Information Technology and Services:** 38.6% - **Computer Software:** 19.3% - **Marketing and Advertising:** 7.0% - **Industrial Automation:** 5.3% - **Retail:** 3.5% - **Writing and Editing:** 3.5% - **Publishing:** 1.8% - **Music:** 1.8% - **Management Consulting:** 1.8% - **Internet:** 1.8% - **Other:** 15.8% #### Microsoft Outlook - **Information Technology and Services:** 13.3% - **Computer Software:** 8.1% - **Financial Services:** 3.6% - **Hospital & Health Care:** 3.5% - **Higher Education:** 3.3% - **Marketing and Advertising:** 3.3% - **Education Management:** 2.8% - **Staffing and Recruiting:** 2.6% - **Accounting:** 2.5% - **Non-Profit Organization Management:** 2.2% - **Other:** 54.7% --- ## Alternatives ### Alternatives to Thunderbird - [Front](https://www.g2.com/products/front/reviews) — 4.7/5 stars (2466 reviews) - [Spike](https://www.g2.com/products/spike/reviews) — 4.6/5 stars (262 reviews) - [Mailbird](https://www.g2.com/products/mailbird/reviews) — 3.6/5 stars (101 reviews) - [BlueMail](https://www.g2.com/products/bluemail/reviews) — 4.3/5 stars (53 reviews) - [Shift](https://www.g2.com/products/redbrick-shift/reviews) — 4.5/5 stars (264 reviews) - [Canary Mail](https://www.g2.com/products/canary-mail/reviews) — 4.5/5 stars (53 reviews) - [Zimbra Desktop](https://www.g2.com/products/zimbra-desktop/reviews) — 4.4/5 stars (22 reviews) - [Mailspring](https://www.g2.com/products/mailspring/reviews) — 3.8/5 stars (18 reviews) - [K-9 Mail](https://www.g2.com/products/k-9-mail/reviews) — 4.5/5 stars (13 reviews) - [Superhuman Mail](https://www.g2.com/products/superhuman-mail/reviews) — 4.7/5 stars (1249 reviews) ### Alternatives to eM Client - [Spike](https://www.g2.com/products/spike/reviews) — 4.6/5 stars (262 reviews) - [Mailbird](https://www.g2.com/products/mailbird/reviews) — 3.6/5 stars (101 reviews) - [BlueMail](https://www.g2.com/products/bluemail/reviews) — 4.3/5 stars (53 reviews) - [Mailspring](https://www.g2.com/products/mailspring/reviews) — 3.8/5 stars (18 reviews) - [Front](https://www.g2.com/products/front/reviews) — 4.7/5 stars (2466 reviews) - [Shift](https://www.g2.com/products/redbrick-shift/reviews) — 4.5/5 stars (264 reviews) - [Kiwi for Gmail](https://www.g2.com/products/kiwi-for-gmail-kiwi-for-gmail/reviews) — 4.4/5 stars (58 reviews) - [Superhuman Mail](https://www.g2.com/products/superhuman-mail/reviews) — 4.7/5 stars (1249 reviews) - [Zoom Workplace](https://www.g2.com/products/zoom-workplace/reviews) — 4.5/5 stars (56397 reviews) - [Missive](https://www.g2.com/products/missive/reviews) — 4.7/5 stars (831 reviews) ### Alternatives to Microsoft Outlook - [Spike](https://www.g2.com/products/spike/reviews) — 4.6/5 stars (262 reviews) - [Google Workspace](https://www.g2.com/products/google-workspace/reviews) — 4.6/5 stars (48026 reviews) - [Superhuman Mail](https://www.g2.com/products/superhuman-mail/reviews) — 4.7/5 stars (1249 reviews) - [Zoho Mail](https://www.g2.com/products/zoho-mail/reviews) — 4.4/5 stars (715 reviews) - [Calendly](https://www.g2.com/products/calendly/reviews) — 4.7/5 stars (2642 reviews) - [Front](https://www.g2.com/products/front/reviews) — 4.7/5 stars (2466 reviews) - [Proton Mail For Business](https://www.g2.com/products/proton-mail-for-business/reviews) — 4.6/5 stars (316 reviews) - [Shift](https://www.g2.com/products/redbrick-shift/reviews) — 4.5/5 stars (264 reviews) - [iCal](https://www.g2.com/products/ical/reviews) — 4.1/5 stars (196 reviews) - [Titan](https://www.g2.com/products/titan-titan/reviews) — 4.6/5 stars (561 reviews) --- ## Top Discussions ### Thunderbird - Title: [Has anyone managed to use the copy and paste function from excell?](https://www.g2.com/discussions/12306-has-anyone-managed-to-use-the-copy-and-paste-function-from-excell) — 2 comments, 1 upvote > **Top comment:** "Strange -- when I do it, the columns and rows are maintained (though some of the formatting is not kept). What version are you using? I'm still using..." - Title: [What is the use of Thunderbird software?](https://www.g2.com/discussions/what-is-the-use-of-thunderbird-software) — 1 comment, 1 upvote > **Top comment:** "It allows you to manage multiple emails in a single window without back and forth switching. That's the main use I found. Besides that, it also has a good..." - Title: [Has anyone managed to use the copy and paste function from excell?](https://www.g2.com/discussions/30110-has-anyone-managed-to-use-the-copy-and-paste-function-from-excell) — 1 comment > **Top comment:** "Thunderbird does not recognize Excel’s formatting the way Outlook can. But, it can recognize formatting from Word. Copy paste from Excel to Word, then from..." ### eM Client - Title: [Is eM client any good?](https://www.g2.com/discussions/is-em-client-any-good) — 3 comments > **Top comment:** "emClient is a very solid option as an email client. Easy-to-use and support is decent." - Title: [Is eM client really free?](https://www.g2.com/discussions/is-em-client-really-free) — 2 comments > **Top comment:** "Yea, I use it with two email accounts and it’s free,i think that is the limit though. More accounts is what causes it to charge. I’ve not found any features..." - Title: [What is eM Client used for?](https://www.g2.com/discussions/what-is-em-client-used-for) — 1 comment > **Top comment:** "eM Client is used as a full-featured email and collaboration client to manage emails, calendars, contacts, and tasks in one place. It supports Exchange,..." ### Microsoft Outlook - Title: [What are the latest integrations and features in Microsoft Outlook that enhance email communication and productivity?](https://www.g2.com/discussions/microsoft-outlook-what-are-the-latest-integrations-and-features-in-microsoft-outlook-that-enhance-email-communication-a) — 6 comments, 3 upvotes > **Top comment:** "I like that you can pin conversations to the top of the email." - Title: [What are the features of Outlook?](https://www.g2.com/discussions/what-are-the-features-of-outlook) — 5 comments > **Top comment:** "Mail and calendar are the top features." - Title: [What business advantages does Outlook give over Gmail?](https://www.g2.com/discussions/best-for-business) — 5 comments, 1 upvote > **Top comment:** "There are several. One main one is that your email is stored (with Exchange) on your own server's rather than Google's. Also, there is built-in MS Office..." - Title: [What are the latest integrations and features in Microsoft Outlook that enhance email communication and productivity?](https://www.g2.com/discussions/what-are-the-latest-integrations-and-features-in-microsoft-outlook-that-enhance-email-communication-and-productivity) — 4 comments, 1 upvote > **Top comment:** "It's actually too much to generalize. But it has provided a stronger back protection against spam mails, an artificial intelligence integration that can..." - Title: [What is Microsoft Outlook used for?](https://www.g2.com/discussions/what-is-microsoft-outlook-used-for) — 4 comments > **Top comment:** "Microsoft outlook is used to send and receive emails. it is also used to manage calendar, tasks, meetings and contacts" --- **Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/thunderbird-vs-em-client-vs-microsoft-outlook)