Technology · head to head
Microsoft Outlook vs Zeta
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
- -
Zeta
Technology
Cloud native credit card processing and core banking from Bhavin Turakhia's Zeta
- From
- On request
- Rated
- -
The short version
- Only Microsoft Outlook has a free tier, so it costs nothing to try first.
- 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.; Zeta it competes against card processors with decades of production track record, and in card processing an outage is a public event, so a shorter operational history is a genuine risk factor rather than a technicality.
- They diverge on capability: Microsoft Outlook covers Exchange calendar integration, Zeta covers Tachyon card processing.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Microsoft Outlook and Zeta actually diverge.
| Attribute | Microsoft Outlook | Zeta |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | freemium | quote |
| Free tier | Yes | No |
| Platforms | Web | Web, API, Cloud, iOS, Android |
Identical on both: 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 Zeta
- Tachyon card processing
- Real time authorisation
- Rewards and offers engine
- Core banking modules
- Programme configuration
- Mobile and web SDKs
- Fraud and controls
- Cloud deployment
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 Zeta
- Executive assistants managing someone else's calendar and mailbox through delegate access, which no IMAP client supports properlynot Zeta
- Regulated environments that need retention policies, legal hold and eDiscovery applied to mail centrally rather than per usernot Zeta
- Teams handling shared inboxes such as support or accounts, where permissions and tracking matter more than the mail client itselfnot Zeta
Zeta
- A United States bank whose card platform makes launching a new rewards product a multi quarter vendor projectnot Microsoft Outlook
- An issuer that wants authorisation level controls and real time data rather than end of day filesnot Microsoft Outlook
- A large fintech launching a credit card programme at scale with custom product logicnot Microsoft Outlook
- A bank consolidating card and deposit processing onto one modern platformnot 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.
Zeta
- It competes against card processors with decades of production track record, and in card processing an outage is a public event, so a shorter operational history is a genuine risk factor rather than a technicality.
- Contracts are enterprise scale and quoted with volume minimums, which puts it out of reach of small issuers who would otherwise benefit most from modern tooling.
- A card portfolio migration runs twelve to twenty four months at minimum, during which the issuer runs two platforms and pays for both.
- Zeta is a processor rather than a licence holder, so network membership, BIN sponsorship and regulatory obligations remain entirely with the issuer.
- Public references for large live United States production volumes are fewer than the announcements imply, so diligence should insist on active account counts and uptime history rather than partnership press releases.
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$12.99/month
- 1-6 users
- Up to 6 TB total cloud storage (1 TB per person)
- Same apps and features as Personal
Zeta
On request- Tachyon platform$undefined/year
- Quoted per institution, commonly on active accounts or transaction volume
- Implementation for a card portfolio migration measured in quarters to years
- Minimum volume commitments typical on enterprise contracts
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 Zeta if
- You need tachyon card processing.
- You work on Web, API, Cloud, iOS, Android.
- You also want real time authorisation.
Questions people ask
- Is Microsoft Outlook or Zeta better?
- Neither clearly leads. Microsoft Outlook starts at Free and Zeta at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Microsoft Outlook or Zeta?
- Microsoft Outlook has a free tier; the other does not. Paid plans start at Free for Microsoft Outlook and On request for Zeta.
- Does Microsoft Outlook or Zeta run on more platforms?
- Microsoft Outlook runs on Web. Zeta runs on Web, API, Cloud, iOS, Android.
- Can I use Microsoft Outlook for free?
- Yes. Microsoft Outlook has a free tier, so you can try it without paying. Zeta starts at On request.
- 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 Zeta is typically brought in for.
- What can Microsoft Outlook do that Zeta cannot?
- Microsoft Outlook covers Exchange calendar integration, Delegate access, Shared mailboxes, Rules and Quick Steps. Zeta covers Tachyon card processing, Real time authorisation, Rewards and offers engine, Core banking modules.
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.
Zeta: Which Zeta is this?
The banking technology company founded by Bhavin Turakhia, which builds the Tachyon card processing and core banking platform. Not any similarly named payroll or accounting product.
Microsoft 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.
Zeta: What is its strongest use case?
United States credit card issuing and processing, where legacy platforms make product changes slow and expensive.
Microsoft 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.
Zeta: Does Zeta provide the BIN or licence?
No. It processes. Network membership, BIN sponsorship and regulatory obligations stay with the issuer.
Microsoft 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.
Microsoft 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.
Related pages
More on Microsoft Outlook
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