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Exchange Online supports the Microsoft Exchange ActiveSync protocol, which synchronizes mailbox data between mobile devices and Exchange Online, so users can access their email, calendar, contacts, and tasks on the go.

With many organizations these days encouraging their employees to bring their own mobile devices to work, it has become super-imperative for administrators to keep track of which mobile devices are accessing Exchange Online and syncing with the mailboxes hosted on it, and what are the most popular devices. This information is critical, as they help administrators understand the type of devices that frequently interact with Exchange Online, so that they can accordingly define access policies, DLP policies, and anti-malware protection policies to protect the mailboxes and data hosted online. This is where the EXODevicConTest test helps!

This test captures and reports the count and details of ActiveSync-enabled mobile devices and device types that are syncing with mailboxes hosted on Exchange Online. With the help of this information, administrators can quickly identify devices that are popular and the configuration (OS, OS language, mail client) of such devices, so that access policies can be prudently defined.

Outputs of the test : One set of results for the Office 365 tenant being monitored.

Measurement	Description	Measurement Unit	Interpretation
Unique_user_agents	Indicates the number of mobile device user agents accessing Exchange Online.	Number	The User-Agent header contains a line of text that can be used to identify a mobile device. Using the detailed diagnosis of this measure, you can view the top-20 user-agent strings, in terms of the number of mobile devices supporting those strings. From the user-agent strings, you will be able to figure out the type of mobile devices interacting with Exchange Online.
Unique_device_types	Indicates the number of mobile device types that are syncing with Exchange Online.	Number	Use the detailed diagnosis of this measure to view the top-20 mobile device types, in terms of the number of mobile devices of that type accessing Exchange Online.
Unique_operating_systems	Indicates the number of mobile operating systems accessing Exchange Online.	Number	Use the detailed diagnosis of this measure to view the top-20 mobile operating systems, in terms of the number of mobile devices running those operating systems.
Unique_clients	Indicates the number of mail clients that are interacting with Exchange Online.	Number	Use the detailed diagnosis of this measure to view the top-20 mail clients, in terms of the number of mobile devices supporting those clients.
Unique_device_OS_languages	Indicates the number of unique device OS languages in use in the mobile devices that are interacting with Exchange Online.	Number	Use the detailed diagnosis of this measure to view the top-20 OS languages, in terms of the number of mobile devices that have been configured with those languages.
Synchronized_devices	Indicates total number of mobile devices syncing with mailboxes on Exchange Online.	Number	This is a good indicator of the device load on Exchange Online.