Behavior:
If you start a third-party application which accesses Outlook in a windowless mode (for example „Evatic ERP“) and start Outlook afterwards, this error message appears:
The logon did not suceed, either because one or more of the parameters to MAPILoginEx were invalid or because there were too many sessions open
Solution:
When you start Outlook first and then the software “Evatic ERP“ there will be no error message.
A Workaround is to start Outlook before you start any application, that accesses Outlook or MAPI Profiles.