It turned out that Groupwise was conflicting with it. I followed the
directions in this article and it fixed the problem.

http://support.microsoft.com/default...b;en-us;260199

"goplayoutside" wrote:

When I customize my toolbar, the changes do not stay when I close Excel. I
tried to remane the .xlb file, but the changes still did not save. Is there
something else I can do?