Technology · head to head
Microsoft Outlook vs Segment
Microsoft Outlook
Technology
Microsoft's email and calendar client, in the middle of a transition from the classic Windows application to a web-based replacement.
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Microsoft Outlook microsoft is replacing the classic Win32 client with the new web-based Outlook, and the new one runs only web add-ins, not COM add-ins, so any line-of-business integration for CRM, dictation, document management or telephony must be rewritten or the desktop stays on classic until its support window closes.; Segment pricing is not transparent; requires sales contact for quotes
- They diverge on capability: Microsoft Outlook covers Exchange calendar integration, Segment covers Data collection.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Microsoft Outlook and Segment actually diverge.
| Attribute | Microsoft Outlook | Segment |
|---|---|---|
| Pricing model | freemium | Unknown |
| Platforms | Web | Web, API |
| Founded | Unknown | 2011 |
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Technology).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Microsoft Outlook
- Exchange calendar integration
- Delegate access
- Shared mailboxes
- Rules and Quick Steps
- Retention, hold and eDiscovery
- Sensitivity labels and encryption
- Add-in platform
- Offline cached mode
Only in Segment
- Data collection
- Data routing
- Data warehouse
- Identity resolution
- Protocols
- Privacy portal
- Functions
- Replay
What people use each for
The jobs each tool is most often brought in to do.
Microsoft Outlook
- Organisations on Exchange Online or Exchange Server where free/busy scheduling and room booking across everyone is a daily requirementnot Segment
- Executive assistants managing someone else's calendar and mailbox through delegate access, which no IMAP client supports properlynot Segment
- Regulated environments that need retention policies, legal hold and eDiscovery applied to mail centrally rather than per usernot Segment
- Teams handling shared inboxes such as support or accounts, where permissions and tracking matter more than the mail client itselfnot Segment
Segment
- Customer data unificationnot Microsoft Outlook
- Marketing attributionnot Microsoft Outlook
- Product analyticsnot Microsoft Outlook
- Data governancenot Microsoft Outlook
- Personalizationnot Microsoft Outlook
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Microsoft Outlook
- Microsoft is replacing the classic Win32 client with the new web-based Outlook, and the new one runs only web add-ins, not COM add-ins, so any line-of-business integration for CRM, dictation, document management or telephony must be rewritten or the desktop stays on classic until its support window closes.
- The new client's handling of non-Microsoft accounts synchronises mail through Microsoft's cloud rather than connecting from the machine to the provider, which several organisations' data residency and handling policies do not allow, and it is not an optional behaviour.
- PST and OST files are a single-file, corruptible and effectively unshareable store, and the new client's reduced PST support means years of personal archives sitting in those files need an explicit migration plan rather than carrying forward.
- Large mailboxes turn software problems into administration ones: search index rebuilds, OST files of tens of gigabytes and the mailbox quotas of whichever plan was bought, and the usual fix is archiving policy rather than anything a user can do.
- Against IMAP or Gmail you lose most of what justifies it, including free/busy lookup, room booking, delegate access, and retention and compliance policies, because those are Exchange server features rather than client features.
- The five or six products sharing the Outlook name have materially different feature sets, so internal documentation, training and support procedures must be written per platform and a user moving between desktop, web and mobile finds the same task done differently in each.
Segment
- Pricing is not transparent; requires sales contact for quotes
- No lower-tier option for small businesses without contacting sales
- Custom pricing can be expensive for mid-market companies
- Now owned by Twilio, which affects long-term independence and focus
Pricing, plan by plan
Microsoft Outlook
Free- Outlook (Free)Free
- 15 GB mailbox storage
- 5 GB cloud storage
- Web and mobile Office app access
- Microsoft 365 Basic$1.99/month
- 100 GB mailbox storage
- 100 GB cloud storage
- Ad-free experience
- Microsoft 365 Personal$9.99/month
- 1 TB cloud storage
- Desktop Office apps (Word, Excel, PowerPoint, Outlook, OneNote)
- Copilot with high usage limits
- Microsoft 365 Family$12.99/month
- 1-6 users
- Up to 6 TB total cloud storage (1 TB per person)
- Same apps and features as Personal
Segment
FreeNo published plan breakdown. See the Segment review.
Which should you pick?
Choose Microsoft Outlook if
- You need exchange calendar integration.
- You want to start without paying.
- You also want delegate access.
Choose Segment if
- You need data collection.
- You want to start without paying.
- You work on Web, API.
- You also want data routing.
Questions people ask
- Is Microsoft Outlook or Segment better?
- Neither clearly leads. Microsoft Outlook starts at Free and Segment at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Microsoft Outlook or Segment?
- Microsoft Outlook starts at Free and Segment at Free.
- Does Microsoft Outlook or Segment run on more platforms?
- Microsoft Outlook runs on Web. Segment runs on Web, API.
- Can I use Microsoft Outlook for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Microsoft Outlook best used for?
- Microsoft Outlook is most often used for organisations on exchange online or exchange server where free/busy scheduling and room booking across everyone is a daily requirement, executive assistants managing someone else's calendar and mailbox through delegate access, which no imap client supports properly, regulated environments that need retention policies, legal hold and ediscovery applied to mail centrally rather than per user, teams handling shared inboxes such as support or accounts, where permissions and tracking matter more than the mail client itself. Of those, organisations on exchange online or exchange server where free/busy scheduling and room booking across everyone is a daily requirement and executive assistants managing someone else's calendar and mailbox through delegate access, which no imap client supports properly are not what Segment is typically brought in for.
- What can Microsoft Outlook do that Segment cannot?
- Microsoft Outlook covers Exchange calendar integration, Delegate access, Shared mailboxes, Rules and Quick Steps. Segment covers Data collection, Data routing, Data warehouse, Identity resolution.
Answered from the vendors’ own pages
Microsoft Outlook: What is the difference between classic Outlook and the new Outlook for Windows?
Classic is the long-standing Win32 application shipped with Microsoft 365 and Office LTSC. The new Outlook is a web-based client that replaced Windows Mail and Calendar. The most consequential difference is add-ins: the new client supports only web add-ins, not COM add-ins.
Segment: Does Segment have a free plan?
Segment uses a freemium model with 10K users included free. Additional users require paid plans based on monthly active users (MTUs), calculated as monthly active users plus anonymous visitors per month.
SourceMicrosoft Outlook: How long will classic Outlook be supported?
Microsoft has stated support through at least 2029. That is a planning window rather than a reprieve, and organisations with COM add-in dependencies should be scoping the replacement work now.
Segment: What is Segment's pricing based on?
Segment pricing is based on monthly active users (MTU), which equals your monthly active users plus anonymous visitors. Pricing is customized; contact sales for specific quotes.
SourceMicrosoft Outlook: Can I use Outlook with Gmail or another IMAP provider?
Yes, but with reduced capability. You lose free/busy lookup, room booking, delegate access and server-side compliance policies, because those come from Exchange rather than from the client.
Segment: What is the difference between Customer Data Pipeline and Customer Data Platform?
Pipeline (Business) focuses on data collection and delivery to 700+ destinations. CDP includes Pipeline plus Unify for unified profiles and Engage for audience orchestration with AI capabilities.
SourceMicrosoft Outlook: Is Outlook free?
Outlook on the web and the mobile apps are free with a Microsoft account, and the new Outlook for Windows is included with Windows 11. The classic desktop application requires a Microsoft 365 subscription or an Office perpetual licence.
Segment: How many integrations does Segment have?
Segment connects to over 700 destinations, allowing data to be sent to analytics platforms, data warehouses, CRMs, and other business tools.
SourceMicrosoft Outlook: Will my COM add-ins work in the new Outlook?
No. The new client supports only the cross-platform web add-in model. Vendors must publish a web add-in, and where they have not, the choice is to stay on classic Outlook or replace the integration.
Segment: Does Segment have SSO and HIPAA compliance?
Yes. Both Pipeline and CDP tiers offer multi-factor authentication, single sign-on (SSO), and HIPAA eligibility for healthcare organizations.
SourceRelated pages
More on Microsoft Outlook
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