OWA and Microsoft Edge

Well after searching a bunch, it looks like OWA on Exchange 2010 is broken on windows 10's edge browser. It opens fine, but won't open the attachment window. Fine job there MS!

There are 3 workarounds, use a different browser, open in IE via edge, or run the light version. We all know how users are, and all options kind of suck in their own way. I think I've settled on the "best" crappy way is to use the Open in IE option, but now how to convey that to Joe user logging in from his shiny new PC at home for the first time.

Ideally what I want to do is just Add a big red text line to our logon page. Something that says.

Windows 10 users, Microsoft Edge does not support OWA. Please open in IE by clicking the 3 dots in the top right, and choose Open in Internet Explorer.

How would I go about doing that. I've read a bit about the OWA themes, but nothing I've seen addresses adding a paragraph to the logon.aspx page.
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bhiebAuthor Commented:
I did find a decent 4th option on machines I have control over. That is to create a shortcut to IE, and path to the site (see below). Still would like to modify the logon page to notify users of the issue.

"%ProgramFiles(x86)%\Internet Explorer\iexplore.exe" https://myowasite.com/
Cliff GaliherCommented:
This didn't sound right to me, and I am unable to replicate your results. I just fired up Edge, connected to an Exchange 2010 SP3 OWA mailbox, and opened word document attachments, a PDF, and others. No issues here...
bhiebAuthor Commented:
Not open attachments, open the window to attach a file.
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bhiebAuthor Commented:
I can't get the attach file screen to pop up at all, even with pop up blocker turned off.
JohnBusiness Consultant (Owner)Commented:
Consider using IE 11 on Windows 10. I do this and I made IE 11 default. It works and Edge is new and still has issues.
Cliff GaliherCommented:
Ahh, you are probably out of luck then. The attachment upload in non-lite uses Silverlight, which Edge doesn't use or support. And Exchange 2010 is out of mainstream support, so feature upgrades are likely not going to be happening to add an HTML version of this. Chrome 26 has a similar issue because of how Chrome tried to load Silverlight.   Editing the login page the way you want is also not really possible reliably because of how Exchange relies on forms-based authentication for various things. Good way to break ActiveSync and EWS if you try.

Best you can reliably do is user education and start planning your move to Exchange 2013/2016/Online.

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bhiebAuthor Commented:
John, thanks but I'm more concerned with how to let my remote users know this. Regardless of the workaround I need a way to let windows 10 users know that there is an issue, and to take that option. Otherwise they end up calling me assuming our side is broken. I would actually prefer that, as then I could fix it.
bhiebAuthor Commented:
So Cliff, can you confirm this is no longer an issue in 2016/365?
Cliff GaliherCommented:
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