This can happen for a number of reasons
If you are using the latest version of Aid4Mail, you may be experiencing MAPI or DLL errors due to a bad or corrupt Outlook installation which needs repairing.
To repair your Outlook installation, please follow the steps found on the Microsoft Support Page about repairing an Office installation.
Ensure you select "Online Repair" instead of "Quick Repair".
Once you have repaired your installation, please make sure your Office installation is up-to-date.
This should resolve the MAPI or DLL errors you are encountering.
Should you require any assistance, please don't hesitate to contact the help desk.
For more information about Aid4Mail, please visit our website.