Number format not applied to values in email

[psteiwer]

Example value in Excel:
<td style="mso-number-format:#0\.0" x:num>6.515151515151515152</td>
Excel understands this style, email clients do not. This means when opened in Excel, the format is applied. In the email, the format is not applied. I am not sure where the style is lost, but the email seems to convert it at some point:

<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal>6.515151515151515152</p>
</td>

This may mean that while writing to the email, we need to deconstruct the mso-number-format and apply formatting to the actual number instead of trying to pass through a number format