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Acuity Not Syncing With Outlook / Office 365

Workaround available Web, Outlook Updated October 21, 2026

Quick answer

Two-way sync only works with web-based Outlook.com, Office 365 with an online calendar, or Exchange. Other Outlook setups can only use a one-way subscription, and Microsoft calendars can lag up to 10 minutes.

Most likely fix: Identify your Outlook type.

Symptoms

Outlook appointments don't block Acuity times, Acuity bookings don't show in Outlook, or edits made in Outlook revert.

Why it happens

  • Office 365 plan without an online calendar (two-way sync unsupported)
  • Desktop-only Outlook, which only supports one-way subscription
  • Exchange public folders (unsupported)
  • Edits made in Outlook are overwritten because Acuity is the source of truth
  • Normal Microsoft sync delay of up to 10 minutes

How to fix it

Try these in order — the most common fix is first.

  1. 1. Identify your Outlook type

    1. Try logging in at outlook.com and at the Office 365 web portal
    2. If neither works, ask your IT team whether you are on Exchange
    3. If none apply, set up a one-way calendar subscription instead

  2. 2. Reconnect the Outlook sync

    1. Go to Sync with Other Calendars
    2. Disable the existing Outlook sync
    3. Reconnect and choose the default calendar

  3. 3. Make changes in Acuity, not Outlook

    1. Reschedule or edit appointments inside Acuity; changes made in Outlook are replaced on the next sync

  4. 4. Allow time for updates

    1. Wait up to 10 minutes before assuming the sync failed

This guide also covers

  • acuity outlook sync not working
  • acuity office 365 calendar
  • acuity exchange sync

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