Andy's VMware vSphere tip#17: Datastore storage: Leave at least 20-30% FREE!
If you create many VMs per datastore, and try to use all the storage space, this is a bad idea, you ideally need to reserve at least 20-30% per datastore based on total storage, to allow for Memory SWAP files - When a VM is powered on, it creates a swap file on the datatore (where the vmx configuration file is stored by default), which is equal to the memory assigned to the VM.
Also snapshots need additional storage space.
You can set alarms to warn you of storage (datastore) space issues.
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It appears that a security update for the CVE-2019-1402 vulnerability in each version of Microsoft Office causes this error. Here is the list of Office security updates that you can uninstall.
Office 2010: Description of the security update for Office 2010: November 12, 2019 (KB4484127)
Office 2013: Description of the security update for Office 2013: November 12, 2019 (KB4484119)
Office 2016: Description of the security update for Office 2016: November 12, 2019 (KB4484113)