Excel uses the
<u\> tag for underline, however this tag appears to not recognized by openpyxl. For example this does not come in with an underline from the openpyxl parser:
-<font> <u/> <sz val="11"/> <color rgb="FF0000FF"/> <name val="Calibri"/> </font>
When openpyxl sets underline in it's output it uses
<u val="single"/>. This is accepted by Excel, but when Excel saves it reverts to `<u/>'.
-<font> <color rgb="000000FF"/> <u val="single"/> </font>
I'm using Excel 2010 and openpyxl 2.4.5.