From 7am this morning some users were experiencing issues connecting to our Hosted Exchange 2016 platform, on call technicians were contacted and started investigating the problem. The Neos tech found that one of the databases were dismounted due to an EDB size limit imposed by Microsoft Exchange. Neos tech found a fix from Microsoft to work around the issue and patched the required servers. Note: Because this was a software limit reached for a particular database, it affected some users on all servers within the cluster as the databases wouldn't fail over, as the servers themselves were fine no alarm notifications were sent. The patch is now in place, however we are closely monitoring the Exchange cluster and are investigating measures to mitigate any future occurrences of the fault.