# Understanding permissions in Microsoft Office 365
When signing up for the product with a Microsoft account, you grant Roombelt permission to access and modify events in your calendars in Outlook. Roombelt uses this permission whenever it interacts with Microsoft 365.
Let's call the user who signed up to Roombelt and configured devices an **admin user.** When someone taps the button to create a meeting from a tablet, Roombelt creates the meeting in the name of the admin user (The admin user will be a creator of the meeting in Outlook).
{% hint style="warning" %}
The admin user needs to sign in to Roombelt at least once every 90 days. Otherwise, Microsoft will revoke Roombelt access to your calendars.
{% endhint %}
Moreover, Roombelt can read and edit only the calendars visible on the calendar list in the admin user account in Outlook (see screenshot below). If a meeting room is missing in Roombelt or marked as read-only, see [how-to-add-missing-microsoft-365-room](https://docs.roombelt.com/tutorials-and-troubleshooting/how-to-add-missing-microsoft-365-room "mention").
Outlook with highlighted list of current user's calendars
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