Did you just find a download or a file on your computer that has a digital signature from PowerInbox Inc.? If so, please read on.
You will typically notice PowerInbox Inc. when clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for PowerInbox Inc. with the following steps:
Here is a screengrab of a file that has been signed by PowerInbox Inc.:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This means that the file has been published by PowerInbox Inc. and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also see the address for PowerInbox Inc., such as the street name, city and country.
COMODO Code Signing CA 2 has issued the PowerInbox Inc. certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the PowerInbox Inc. files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/51 | PowerInboxBHO64.dll |
| 0/51 | PowerInboxBHO64.dll |
| 0/46 | UpdateClient.exe |
| 0/43 | PowerInboxBHO.dll |
The detection percentage is based on the fact that I have gathered 191 scan results for the PowerInbox Inc. files. 0 of these scan results came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: