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If your users complain of inaccessibility, you may want to check the quality of the network link to the Exchange server online. A flaky or latent network connection to the server can sometimes deny users access to their mailboxes on the cloud, adversely impacting their overall experience with Exchange Online. To avoid this, periodically run the SaaSNetworkTest test, and check the health of the network connection to Exchange server on the cloud.

This is an external test that emulates a network-level ping to the cloud-based Exchange server and reports whether/not network connectivity to server is available, and if so, how responsive the server is to network requests. In the process, the test reveals any break or slowness in network connection to the Exchange Online service.

Outputs of the test : One set of results for the Exchange server on the cloud.

Measurement	Description	Measurement Unit	Interpretation
Avg_delay	Indicates the average delay between transmission of packet to the server and receipt of the response to the packet at the source.	Seconds	An increase in network latency could result from misconfiguration of the router(s) along the path, network congestion, retransmissions at the network, etc.
Min_delay	The minimum time between transmission of a packet and receipt of the response back from the serverl.	Seconds	A significant increase in the minimum round-trip time is often a sure sign of network congestion.
Pkt_loss_pct	Indicates the percentage of packets lost during transmission from source to server and back.	Percent	Packet loss is often caused by network buffer overflows at a network router or by packet corruptions over the network. The detailed diagnosis for this measure provides a listing of routers that are on the path from the external agent to target server, and the delays on each hop. This information can be used to diagnose the hop(s) that could be causing excessive packet loss/delays.
Availability	Indicates whether the network connection to the target server is available or not	Percent	A value of 100 indicates that the server is connected over the network. The value 0 indicates that the server is not connected. Typically, the value 100 corresponds to a Packet loss of 0.