For those who upgraded to v1.1.0, there was an issue with the installer not working correctly on vBulletin 4.x systems.
To fix the database errors you will be encountering, please perform the following steps:
1) In your Product Manager, edit the vBMail product and set the Version Number to 1.0.4 manually.
2) Re-download the product
3) Re-import the new product XML file
Sorry for the inconvenience
Fillip