The consensus seems to be an overwhelming, No, and I don't'
see it in my list of shortcut keys from help either.
Shortcut Keys in Excel 2000 (Excel Vers. 9)
http://www.mvps.org/dmcritchie/excel/shortx2k.htm.
The version of Excel isn't going to matter much, especially upward
I understand you want to avoid using the mouse.
But seeing as you don't want to use the mouse to invoke a button,
how do expect to make a selection to run such a keyboard
shortcut on without using the mouse ?
Is the reason you want a built in shortcut and not interested
in a macro because you want to be to use or document use
by anyone, anywhere, anyplace including when macros are
suppressed. If this is strictly for yourself it shouldn't matter..
Since you do have an interest in merging cells you might want
to take a look at
Merge and Unmerge Cells
http://www.mvps.org/dmcritchie/excel/merge.htm