Setting Up Shared Calendars in Outlook the Right Way
The three ways to share a calendar in Outlook, and when each one actually makes sense
By Shehryar Hassan, Microsoft 365 & Azure Consultant
Someone on the team asks to see your calendar, and Outlook gives you three different ways to make that happen. Pick the wrong one and you end up with a calendar that shows too little (just busy blocks with no context) or way too much (full details to someone who only needed to book a meeting room).
The three options
Sharing a calendar gives another person a view of it inside their own Outlook, with a permission level you choose. "Can view when I'm busy" only shows free/busy blocks. "Can view all details" shows subject, location, and attendees. "Can edit" lets them add or change events on your calendar directly.
Delegate access is a step further. A delegate can act as you, respond to meeting invites on your behalf, and manage your calendar as if it were their own. This is what most executive assistants actually need, not just calendar sharing.
Publishing a calendar creates a link anyone can open, including people outside your organization, without needing an Outlook account. It's meant for read-only access, like posting office hours or a team availability page on an intranet site.
Which one to pick
For a coworker who just needs to know when you're free, use free/busy sharing. It's the least you can give away and it's usually enough for scheduling meetings around each other.
For someone managing your inbox and calendar day to day, set them up as a delegate instead of just sharing with edit rights. Delegate access also lets them receive meeting requests sent to you, which plain sharing does not do.
For a calendar meant for people outside your tenant, or for an internal team page nobody needs to log into, publish it. Just remember a published calendar link can be viewed by anyone who has the URL, so don't publish anything with sensitive appointment details in the title.
A common mistake
A lot of admins share every calendar with "can view all details" by default because it's the top option in the dropdown. That's more than most people actually need, and it means meeting subjects and locations are visible to anyone you share with. Start with free/busy, and only go further when someone has a real reason to see more. It's easier to grant more access later than to walk it back after someone has gotten used to seeing everything.
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