How to make a button in html that can be displayed in Outlook 2007?

I have to send an email in HTML format where some buttons appear that are sent to another link. The problem is that the Outlook 2007 mail client does not interpret modern HTML and I can not make myself visualize the appearance of a button. I tried to do it with the tag giving it styles but it does not look like a button since the background color of the button only deals with the size of the text. If I do it with the tag, it visualizes me as if it were a link.

Here are some examples that do not work for Outlook 2007:

<p align=center style='text-align:center'>
  <a href='' style='text-decoration: none;'>
    <button style='color: #ffffff; word-wrap: break-word; font-family: Arial Normal, Arial; border: none; -moz-box-shadow: none; -webkit-box-shadow: none; box-shadow: none; margin-right: 10px; background-color: #169BD5;'>CONFORME</button>
  </a>
</p>

<p align=center style='text-align:center'>
  <a href='' style='margin-bottom:10px; display: inline-block; -webkit-box-sizing: border-box; box-sizing: border-box; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; display: inline-block; border: 1px solid transparent; font-weight: normal; text-align: center; text-decoration: none; white-space: normal;padding: .45em 1em;font-size: 6.5pt; color: #fff; background-color: #169BD5;'>CONFORME</a>
</p>

<p align=center style='text-align:center'>
  <b>
    <span style='font-size:5.5pt;font-family:Arial, Helvetica, sans-serif; padding:2.5pt 2.5pt 2.5pt 2.5pt; background-color: #169BD5;  '>
      <a href='' style='color: white;  padding:2.5pt 2.5pt 2.5pt 2.5pt; text-decoration:  none;'>CONFORME</a>
    </span>
  </b>
</p>