I am curious as to whether anyone knows how to change the interface font of Microsoft Outlook 2007 from Segoe UI(?) to something else, such as Tahoma. It drives me mad that the font in Outlook 2007 clashes with every other program on my system. Oh the inconsistency—ERRGH! One of the reasons I turned off Windows Vista’s Aero theme, other than primarily for performance reasons, was that half of the dialogs still used Tahoma while the rest used Segoe UI. At least when Microsoft chose to make the change from MS Sans Serif to Tahoma, the fonts were relatively similar. (I actually held off on enabling ClearType for a while because the jagged characters of MS Sans Serif, which was common in use at the time, were jarring to the eye when shown next to a ’smooth’ font.)
I’d use Mozilla Thunderbird+Lightning if the combination had more features. Lighting is especially problematic with some of its bugs, eating up my calendar events when I was working with several repeating ones. Most importantly, ActiveSync and Windows Mobile Device Center do not support Thunderbird/Lightning out of the box (and I don’t find BirdieSync, the only available option, worth either my money or RAM).