This rare problem normally resolves itself by restarting the device on which Mailbird is installed. However, if doing so still doesn't rectify the issue, then please contact our Customer Happiness Team by clicking here, and please remember to attach your installation log file.

The file can found in the following location: C:\Users\"your user name"\AppData\Local\Temp

Please include the file called MSI-Mailbird-XXX.Log in your reply (the XXX part will consist of a random number).