Outlook 2007 doesn't remember window size

I had this problem as well, however I have solved it.

I positioned Outlook on the right side of my monitor, and my new notes/emails/tasks to the left. I like to see both things at once. However, Outlook would always open the new email/note/event as a large, irregular window that overlapped the main Outlook window. Frustrating, because I like to see it as described. I would always resize it, use it, close and then test to see if it remembered the size and position. It would not.

So I moved Outlook from my secondary monitor to my primary monitor, and then repeated the positioning. Outlook finally remembered! But, I don't want it on that screen, so I moved it back to the secondary monitor, and to my surprise it did remember.

Problem solved (for me).

Over a year later, I had a different but somewhat related issue with resizing Outlook (2007).
After installing 2 updates to Outlook, upon launching it, Outlook occupied the full screen, rather than the @60% it normally did. The only other apps from the Office Suite I have installed are Excel and One-Note, but they were not affected. I was unable to resize the Outlook window: I could only minimize, maximize, or close it. After uninstalling the 2 updates and rebooting, there was no change.

I then right-clicked the Task Bar and clicked 'Cascade Windows' with the Outlook window open. I then resized it to where I wanted, closed and relaunched. VOILA. After every launch of Outlook, it opens just the way I want, i.e., using about 60% of the screen width and from the top of the screen down to (but not touching) the Task Bar.