# Free/Busy Only

> **ALPHA**

In addition to the syncing calendars will full access rights we also support Free/Busy only synchronization for Exchange and Office 365 accounts connected via Enterprise Connect.

## Pre-Requisites
In order to make use of Enterprise connect with Free/Busy only calendars you must first request access to the feature by contacting us at [support@cronofy.com](mailto:support@cronofy.com).

You must be running a server with either Exchange or Office 365 and have configured a service account with the correct access rights to the target calendars.

Example: Granting the `AvailabilityOnly` folder permission to a service account via Powershell

```
Add-MailboxFolderPermission -Identity professional@example.com -AccessRights AvailabilityOnly -User service_account@example.com
```

## Authorization Process
The authorization process differs slightly from a calendar with full access rights, you must request **only** the `free_busy` scope when [Requesting Delegate Access](/developers/api/enterprise-connect/delegated-access/index.md) to a calendar.

*Please note* that the service account's delegate scope must include `free_busy` in order to authorize this scope. The service account may also have additional delegate scopes.

Should any additional scopes be requested (for example `read_events`) and the service account be unable to read events from the Exchange server you will receive an `unable_to_grant_scope` error in the [callback](/developers/api/enterprise-connect/delegated-access/index.md).

To help you diagnose these errors we have made the errors viewable on the Enterprise Connect section of your Developer dashboard. In addition to this we can also expose the Exchange validation logs via the Developer dashboard to diagnose your connectivity issues - again please contact [support@cronofy.com](mailto:support@cronofy.com) to request access to this.

A simple way to test that the access has been granted correctly is so make these calls and validate the callback has no error.

## Account differences
As the only scope these accounts can be granted is `free_busy` you will be limited to accessing the following methods

In order to identify a Free/Busy only account you can either make a call to [the UserInfo endpoint](/developers/api/identity/userinfo/index.md) and see that the `cronofy.type` is `"free_busy_only”`

In addition to this listing the calendars for a free/busy only account will return a single read only calendar named `"Free Busy"`



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[Read in HTML](/developers/authorization/enterprise-connect/free-busy-only/)