The connector for Office 365 consists of multiple components. To correctly uninstall the connector, log in to the Windows server as an administrator and use the uninstall function in Windows Control Panel.
Using the Control Panel to uninstall the connector deletes the connector from the CloudAccess Admin page. If you just delete the connector for Office 365 icon from the Admin page, all of the components on the Windows server still exist and run. This causes issues in CloudAccess if you need to reinstall the connector, unless you run the connector uninstall from the Windows server before attempting to reinstall a new connector.
Alternatively, you can uninstall the connector by running the following command on the Windows server:
msiexec /x netiq-office365-connector-1.5.1.msi /qb