Upgrade procedure
Appliance services are not available while the upgrade is being applied. Disruption continues until the appliance completes its final restart.
It is a best practice to perform the upgrade at a time when service demand is low.
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OVA images downloaded before June 2, 2017 should use the migration process described in the KBA titled “Migrating from a v8.3 Email Virtual Appliance (initial image) to v8.4”.
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OVA images (except for DLP Analytics Engine) can be upgraded to 8.5.3 directly from 8.3.0, 8.4.0, and 8.5.0.
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DLP Analytics Engine OVA upgrade to 8.5.3 is not supported.
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OVA images (except for DLP Analytics Engine) can be upgraded to 8.5.4 directly from 8.4.0, 8.5.0, and 8.5.3.
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DLP Analytics Engine OVAs can be upgraded to 8.5.4 from 8.5.3.
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The 8.5.3 or prior OVA file must use VMware version 6.x. The 8.5.4 OVA file may use VMware version 6.5 or later, or VMware version 7.x. You cannot upgrade a prior OVA version to 8.5.4 on VMware version 7.x.