it possible to get the count of unread emails to display on the taskbar icon for the app in Windows.
I don’t believe it’s possible to show unread mail counts on the eM Client task bar icon. Only new mail envelope notifications.
The Mac OS does have unread new mail counts in eM Client on the Dock Bar shortcut “as it’s built into the OS Settings to do that” when enabled.
You can also show new mail notifications “in the Windows 10 & 11 Tray”. See the following thread post.