I ran in to the same problem with a fresh install of Windows 10 1803 64 bit, Thunderbird and Omni Accounts.
I had to make sure that Thunderbird was the default mail client and then use Registry...
Type: Posts; User: KerryJ
I ran in to the same problem with a fresh install of Windows 10 1803 64 bit, Thunderbird and Omni Accounts.
I had to make sure that Thunderbird was the default mail client and then use Registry...