No new email indicator for second email accont in Outlook 2007

Hi,

I am using outlook 2007 to manage 2 email accounts. Used outlook 2003 until
recently and never had a problem with this.

When a new email arrives in account 1, the new message indicator shows up in
the taskbar as it is supposed to be.

If a new message arrives in account 2, nothing happens, and I have missed
replying in time to plenty of emails already.

It is just not feasible to check in by fully opening (meaning switching to)
Outlook every five minutes.

Any ideas?