Is the Zivver Office Plugin disabled by Outlook in a Citrix, VMware, or Azure Virtual Desktop (AVD) environment? Or does the background session of the plugin drop or hang? This often happens in non-persistent environments, especially after a migration to Windows 11 or Office 2024.

Cause

Outlook automatically disables add-ins that take longer than an internal threshold (roughly 500 ms) to load. In non-persistent VDI environments, the plugin has to load completely at the start of every new session. This often takes longer than the threshold.

Unstable network connections in VDI and AVD environments can also cause the background session of the plugin to hang or drop.

Solution

Check the plugin version

1. Open Outlook and go to the Zivver tab.
2. Click About Zivver.
   A new window opens that shows the version numbers.
3. Compare the version with the latest version in the release notes.

Is the plugin outdated? Update it with your deployment method. See Outdated Zivver Outlook plugin in your organization causes login failures, SSO errors, or freezing.

Prevent Outlook from disabling the plugin

1. Deploy the registry settings from Make sure that the plugin is enabled at all times with a Group Policy Object (GPO).
2. Make sure that the GPO applies to all VDI sessions, including those based on your golden image.
   The DoNotDisableAddinList setting prevents Outlook from disabling the plugin when it loads slowly.

Keep the plugin data in the user profile

Where your platform allows it, make sure that the data of the plugin is kept in a persistent user profile. This prevents the plugin from fully initializing again in every session.

1. Check which locations the plugin uses for account data. See Account data.
2. Include these locations in the persistent profile or user data of your VDI platform.

Check your antivirus software

1. Check that your antivirus software, such as Microsoft Defender, does not scan or block the plugin files at the start of each session.
   For the locations of the plugin files, see Installation files.

Note

Exclusions in Microsoft Defender alone have not solved this problem in every case. Also apply the other steps on this page.

Other symptoms in VDI environments

In VDI and non-persistent profile environments, users may also temporarily be unable to reopen their own sent message from the Outlook Sent Items folder. The cause is unstable profile synchronization. The problem resolves itself, but not on a fixed schedule.

Still need help?

Does the plugin still disable itself, or do sessions still drop, after the steps above? Contact Zivver Support and include this information:

• The VDI platform (Citrix, VMware, or AVD) and its version.
• Details about the image build.
• Details about the network connection of the VDI sessions.
• The version of the plugin and of Outlook.