I have several PST files open at one time in Outlook 2007. The file sizes range from 70mb to 1.2gb. Until recently, everything was working normally. About 2 days ago something happened and now when I click on a different folder, Outlook takes about 15 seconds to generate the new view. During this time Outlook is completely inaccessible (with the equivalent of the hourglass cursor).
I have run scanpst and then "compact now" on all PST files. The speed is still the same. I ran Office Diagnostics, but there were no errors. I went into Outlook Safe Mode and the speed was the same.
I do not know what is causing this problem, or how to diagnose it further. Any help would be most appreciated.