For Ribbon UI example/documentation from Microsoft, here. They will recommend you use the CustomUI Editor.
Open your file (which must be an Excel 2007+ file extension like XLSX, XLSM, XLAM, etc) in the CustomUI Editor. Then use this XML in the editor:
<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui">
<backstage>
<tab idMso="TabShare" visible="false" enabled="false">
</tab>
</backstage>
</customUI>
Save the file, and close the CustomUI Editor.
Then, open your file. Go to the File/Backstage view and you should see that the Save and Send
tab has been removed:
Note: This has disabled the entire "Save & Send" tab from the backstage view. It should be possible using XML to fine-tune this, i.e., to enable the tab, but disable specific controls therein (e.g., maybe you only want to disable Send as Attachment
but you want to leave the other options enabled, etc.) but I haven't quite worked out the XML hierarchy to disable only the specific Send As Attachment
control.
Hope this helps!
Update from Comments
1) The user will find "normal" functionality when this file is closed, or when another file is Active. The UI customization only applies to the file which contains the Custom UI XML parts, so if you have multiple files open, only this file will be affected by the disabled Save & Send
tab.
2) Unfortunately, this is not compatible with Excel 2003 or prior. The CustomUI/XML is not a part of the legacy XLS files, and as such, cannot be implemented in these versions. For 2003/prior versions of Excel, you will have to use the legacy CommandBars
which can be controlled through VBA. It is relatively easy to put some VBA code that will check which version of Excel, and run a subroutine to disable certain CommandBar
/Controls only if the user is in 2003 or prior versions.
If you try to save this down to an XLS file, you will receive a warning, indicating that this feature is incompatible with the file type:
Additionally, you cannot open an XLS file in the CustomUI Editor.