I had a workstation on the network that Outlook was opening very slowly on. I deleted the users outcmd.dat file which usually solves the problem. It did solve the problem, however, I noticed that this time Outlook didn't recreate the outcmd.dat file in the user's profile.
To further test this wierd behavior, I added a button to the standard toolbar thinking that this would force Outlook to recreate the outcmd.dat file. It didn't! What was even more bizzare was that when I opened up Outlook, my toolbar customization was there! So.... is Outlook is getting the customization from another source??