ActiveExplorer return NULL on new Window user login and running Outlook first time

I'm trying to figure out why ActiveExplorer is returning NULL when the user is a new user login (logged into windows for the first time) and then start outlook for the first time, ActiveExplorer return NULL and we cannot display our command bar and menu bar.

If the user exit Outlook and then start Outlook again, ActiveExplorer return a pointer to ExplorerPtr and then we can display our command bar and menu bar.

Is there something else we can get ExplorerPtr when a user run Outlook for the...

ActiveExplorer return NULL on new Window user login and running Outlook first time