Technology · head to head
Microsoft Outlook vs Soketi
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
- Free plan
- Yes
Soketi
Developer Tools
Self-hosted, Pusher-compatible WebSockets server with a stalled maintenance record
- From
- Free
- Free plan
- Yes
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.; Soketi maintenance has effectively stalled: the maintainer has said time is severely limited, releases are infrequent, and the community has been discussing whether the project is abandoned, which means security fixes may not arrive.
- They diverge on capability: Microsoft Outlook covers Exchange calendar integration, Soketi covers Pusher protocol compatibility.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Microsoft Outlook and Soketi actually diverge.
| Attribute | Microsoft Outlook | Soketi |
|---|---|---|
| Pricing model | freemium | Open source, no licence fee |
| Platforms | Web | Linux, macOS, Windows |
| Category | Technology | Developer Tools |
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
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 Soketi
- Pusher protocol compatibility
- Presence and private channels
- Horizontal scaling
- App management backends
- Webhooks
- Prometheus metrics
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 Soketi
- Executive assistants managing someone else's calendar and mailbox through delegate access, which no IMAP client supports properlynot Soketi
- Regulated environments that need retention policies, legal hold and eDiscovery applied to mail centrally rather than per usernot Soketi
- Teams handling shared inboxes such as support or accounts, where permissions and tracking matter more than the mail client itselfnot Soketi
Soketi
- A Laravel application that already uses Echo and wants to stop paying a hosted realtime providernot Microsoft Outlook
- Realtime notifications or presence indicators where data must not leave your own infrastructure for compliance reasonsnot Microsoft Outlook
- A local or CI environment that needs a Pusher-compatible server without hitting a paid accountnot Microsoft Outlook
- A high-connection-count application where hosted per-connection pricing has become the largest line in the infrastructure billnot 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.
Soketi
- Maintenance has effectively stalled: the maintainer has said time is severely limited, releases are infrequent, and the community has been discussing whether the project is abandoned, which means security fixes may not arrive.
- Dependency drift on Node and uWebSockets.js will eventually force you to fork or migrate, and that cost is unbudgeted at the point you adopt it.
- There is no commercial support to buy, so a production incident at three in the morning is entirely your problem with no escalation path.
- Scaling beyond a single node needs Redis and careful configuration, and getting presence channels correct across nodes is a genuine source of subtle bugs.
- It implements the Pusher protocol rather than tracking it, so any protocol feature Pusher adds later will not appear, and the compatibility guarantee slowly decays.
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
Soketi
Free- SoketiFree
- MIT licensed
- Unlimited connections subject to your own hardware
- No vendor billing
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 Soketi if
- You need pusher protocol compatibility.
- You want to start without paying.
- You work on Linux, macOS, Windows.
- You also want presence and private channels.
Questions people ask
- Is Microsoft Outlook or Soketi better?
- Neither clearly leads. Microsoft Outlook starts at Free and Soketi at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Microsoft Outlook or Soketi?
- Microsoft Outlook starts at Free and Soketi at Free.
- Does Microsoft Outlook or Soketi run on more platforms?
- Microsoft Outlook runs on Web. Soketi runs on Linux, macOS, Windows.
- 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 Soketi is typically brought in for.
- What can Microsoft Outlook do that Soketi cannot?
- Microsoft Outlook covers Exchange calendar integration, Delegate access, Shared mailboxes, Rules and Quick Steps. Soketi covers Pusher protocol compatibility, Presence and private channels, Horizontal scaling, App management backends.
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.
Soketi: Is Soketi still maintained?
Barely. The maintainer has stated that available time is very limited and releases have been sparse; treat it as community-maintained.
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.
Soketi: Do I need to change my client code?
No. Pusher client SDKs and Laravel Echo work by changing the host, port and credentials.
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.
Soketi: What does it cost?
Nothing in licence fees. It is MIT licensed; you pay for the server it runs on.
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.
Soketi: What are people moving to?
Laravel Reverb for Laravel applications, and Sockudo, a Rust reimplementation, for others.
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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