I assume the Outlook preferences you mention is not a regular window, but a dialog box... they have no resizing controls at all, but there's a dirty trick that could help: use ResEdit to change the layout of that dialog, trying to cram it into the reduced SE/30 screen.
WARNING: ResEdit is a very powerful tool, but also extremely dangerous. ALWAYS keep a backup copy of the file you're about to edit, just in case you screw it up!
Disclaimer said, here are the detailed instructions:
1) Drag the application over the ResEdit icon; a big window full of icons will open.
2) Double-click the DITL icon; another window with a text list will open.
3) Now you have to browse (double-clik) thru all these items in the list, until you recognize the offending dialog box... note the ID on the window title and you can move and resize the elements as you like! A couple of notes, though:
•Be certain to click on every item shown, even those apparently using little space -- some text fields have much more reserved space and may hide other elements when they get too close... just edit as needed.
•Regardless of the type of dialog box, the items appear in a movable window. Even if it's much wider than your screen, you can move it from side to side. But if the window is too tall, you'll have no access to the bottom items! (not until MacOS 8, anyway). You're better doing this editing procedure in another Mac with bigger screen, if available.
4) When you have no more DITL resources (the layout of alerts and dialog boxes) to edit, close the list and try to find the selected IDs on the list from the icon DLOG -- or the ALRT icon, if not found there. Double-click to open another editing window.
5) You may now change the coordinates of both position and size of the box, either by typing new values or graphically, just dragging the represented dialog (conveniently rescaled) from the middle, or changing its size thru the small black resizing control (bottom right, as usual). In the MiniScreen menu you may check how will it look on several screen sizes; set it to 512x342 (Classic) for the SE/30 screen.
6) Close every window and confirm ResEdit to save the changes. You're done!
Once again, this is a dirty fix: things won't look beautiful or may cease to work at all. But it's the only way I know of making the dialog items fit into a smaller-than-expected screen.
On the other hand... if the Outlook preferences are shown in a regular window (with title bar) you may try to move it all the way to the left, in order to see the hidden rightmost part -- if there's a zoom control, clicking it should resize the window to the maximum allowed by your screen, actually reducing it in your case.
Hope this helps,