Outlook Office365 Update?

Well this is certainly refreshing, I've just sent some old campaigns through to a Office 365 mailbox and the pre-processor is certainly a lot more relaxed than it has been. Microsoft have indeed appeared to have updated OWA.

• No longer is it adding HTML4 tags like <b> <u> and <font> in replacement of CSS style properties like font-weight:bold;
• text-decoration:none; is now supported, one of the major issues with links/call to action buttons
• Text justification doesn't seem to be any issue any more either.

Can't really comment on background images as don't really do much work with them, but generally it appears the other issues you mentioned are indeed working.

It seems the CSS support level of Office 365 just got a major boost, though no CSS3 however.

Someone mark this day as the day OWA didn't totally suck any more!

Another major change is Office 365 no longer strips ID and Classes from elements, it does however prepend x_ to the original names you use.

Its rendering of CSS in the head appears to be a bit more functional (previously it seem to render only some for no explainable reason). Now the styles end up just before the main body of your email. The structure of divs leading up to your email template has changed as well.

The rps_95c6 class tends to change to a different sequence.

<div style="" id="Item.MessagePartBody" role="region" autoid="_rp_K" class="_rp_M3"> 
    <div style="" tabindex="0" role="button" id="Item.MessageUniqueBody" class="_rp_N3 ms-font-weight-regular ms-font-color-neutralDark rpHighlightAllClass rpHighlightBodyClass">
        <div class="rps_95c6">
            <style type="text/css">
                            /* Head styles are put here */
            </style>
        <div>
            <div>
                            <!-- Body of HTML email template here -->
            </div>
        </div>
    </div>
</div>

Well that's pretty cool.
If you (or anyone) notice any other updates to the rending let us know.