How to Removing unwanted plug-ins from vCenter Server

Start your web browser, go to https://vcenter server name or IP/mob
Click Content.
Click ExtensionManager.
Select and copy the name of the plug-in you want to remove from the list of values under Properties. For a list of default plug-ins, see the Additional Information section of this article.
Click UnregisterExtension. A new window appears.
Paste the name of the plug-in and click Invoke Method. This removes the plug-in.
Close the window.
Refresh the Managed Object Type:ManagedObjectReference:ExtensionManager window to verify that the plug-in is removed successfully.

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Create Email enabled contacts bulk

Create an input file name contacts1.csv with the following attributes and values

Open the Exchange management shell and run the below cmd after copying all contacts to the path of shell

Import-Csv “contacts1.csv” | ForEach {New-MailContact -Name $_.Name -Firstname $_.FirstName -LastName $_.LastName -ExternalEmailAddress $_.ExternalEmailAddress -OrganizationalUnit “Domainname/OUname”}