After installing, set riched20.dll to native,builtin in winecfg. This is needed for some dialog boxes and numbers on graphs to display properly. It is not necessary to install the dll with winetricks, as Office installs its own version. Do not set this override globally unless you have Office installed in a separate wineprefix.
Window Resizing Issues
Workarounds for bugs 23805 and 30587:
Solution 1: Run in an emulated virtual desktop. This is probably the easiest solution for most users.
Solution 2: Uncheck "Allow the window manager to control the windows" in winecfg. The downside is that Excel will no longer show up in the taskbar.
Solution 3: (KDE users only) In System Settings, Window Behavior, do the following:
Select Window Rules
Click "New..." to create a new Window Rules
Enter the description
Window Class: Regular Expression: value *\b(winword.exe|excel.exe|powerpnt.exe)\b.*
Check "Match whole window class"
Check on tab "Size & Position"
Check "Full screen": value Force, No
Check "Ignore Requested Geometry": value Force, Yes