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Head-to-head · Calendar Apps

Microsoft Outlook vs KOrganizer

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Microsoft Outlook #2 in Calendar Apps 9.2/10 Free plan · 30-day trial Free planFree trial✓ 2 of 4 features Visit site
KOrganizer #8 in Calendar Apps 8.6/10 Free plan Free plan✓ 1 of 4 features Visit KDE

Microsoft Outlook leads on 0 checks, KOrganizer on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMicrosoft Outlook · 9.2/10
  • Free planboth
  • Free trialonly Microsoft Outlook
  • Most featuresMicrosoft Outlook · 2 of 4

Microsoft Outlook scores higher on our rubric for calendar apps: 9.2 against 8.6 out of 10; our editors rank them #2 and #8.

On calendar sync, KOrganizer gives you Two_way where Microsoft Outlook offers One_way.

Microsoft Outlook is the better fit for microsoft-centered individuals and organizations. KOrganizer is the better fit for linux users needing open-source group calendaring.

  • Microsoft Outlook fits best

    Microsoft-centered individuals and organizations

  • KOrganizer fits best

    Linux users needing open-source group calendaring

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Side by side

Feature Microsoft Outlook 9.2/10 Visit ↗ KOrganizer 8.6/10 Visit ↗
At a glance
Editor score 9.2 8.6
Ranking #2 in Calendar Apps #8 in Calendar Apps
Best for Microsoft-centered individuals and organizations Linux users needing open-source group calendaring
Pricing model Free plan + paid Free
Starting price $99.99/user/yr Free plan
Free plan ✓ ✓
Free trial 30 days —
Deployment Cloud, Desktop, Mobile Desktop
Platforms Web, Windows, macOS, iOS, Android Linux
Support Docs Community, Docs, Email
Integrations 7 integrations 8 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market
Features Microsoft Outlook 2/4 · KOrganizer 1/4
Shared calendars ✓ ✓
Time blocking Not checked yet Not checked yet
Scheduling links Not checked yet Not checked yet
Video meeting support ✓ (best) Not checked yet
Specs
Calendar sync One_way Two_way
Mobile apps Ios and android Not checked yet
Our review
Pros
  • Free account includes core scheduling, sharing, and recurring events
  • Supports Teams, Zoom, Webex, Google Calendar, and more
  • Works across web, Windows, macOS, iOS, and Android
  • Free and open source under the GPL-2.0-or-later license
  • Group scheduling includes invitations, responses, and free/busy data
  • Supports CalDAV, Google Calendar, Nextcloud, Kolab, and more
Cons
  • Personal booking pages have separate licensing requirements
  • Advanced Outlook capabilities require Microsoft 365 subscriptions
  • Cloud storage and Outlook access vary by plan
  • Officially available only as a Linux desktop application
  • No mobile apps for calendar access away from the desktop
  • Does not include verified booking links or time-blocking tools
Our verdict

Microsoft Outlook Calendar is the calendar and scheduling component of Outlook, designed for personal users, organizations, and teams. It covers appointments, recurring events, meeting invitations, reminders, free/busy planning, shared…

Read the review →

KOrganizer is KDE’s calendar and scheduling component for Kontact, designed for Linux desktop users who need more than basic event entry. It brings together events, to-dos, journals, reminders, recurring appointments, multiple calendars,…

Read the review →
  1. Microsoft OutlookCalendar Apps 9.2Free plan · 30-day trial
  2. KOrganizerCalendar Apps 8.6Free plan

Strengths and trade-offs

  • Microsoft Outlook — where it wins

    • Free account includes core scheduling, sharing, and recurring events
    • Supports Teams, Zoom, Webex, Google Calendar, and more
    • Works across web, Windows, macOS, iOS, and Android

    Where it doesn't

    • Personal booking pages have separate licensing requirements
    • Advanced Outlook capabilities require Microsoft 365 subscriptions
    • Cloud storage and Outlook access vary by plan

  • KOrganizer — where it wins

    • Free and open source under the GPL-2.0-or-later license
    • Group scheduling includes invitations, responses, and free/busy data
    • Supports CalDAV, Google Calendar, Nextcloud, Kolab, and more

    Where it doesn't

    • Officially available only as a Linux desktop application
    • No mobile apps for calendar access away from the desktop
    • Does not include verified booking links or time-blocking tools
  • Microsoft Outlook9.2/10 · Free plan · 30-day trial

    A flexible calendar choice for people and teams already working in Microsoft’s ecosystem.

    Visit siteFull verdict →
  • KOrganizer8.6/10 · Free plan

    A capable Linux group calendar for users who value open standards and source freedom.

    Visit KDEFull verdict →

More comparisons

All calendar apps comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update