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Microsoft 365 — View/Edit Calendar without Outlook

A simple way to provide editing access to an Microsoft 365 mailbox calendar is as follows:

  1. Install Mozilla Thunderbird and keep the Lightning plugin when prompted.

  2. Download the ExchangeCalendar plugin.

  3. Install it via ToolsAdd-ons → (Cog) → Install Add-on From File

  4. Add the Calendar via FileNewCalendar.

  5. Choose On The Network, then Microsoft Office 2007/2010/2013.

  6. Choose Office 365 when prompted.

  7. Enter the credentials. For a calendar in a shared mailbox, use this notation.

  8. In Thunderbird, open the calendar with Ctrl-Shift-C.

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