Can't use Contacts in Outlook Webmail to send mail

Question

I can access my company's Outlook Webmail from home, using Safari 10.3.1. No log in problems.
However, when I try to send mail to a contact, the name doesn't appear. My Contacts are all listed and I can review and add to them through Safari and my Options are set to check names against Contact list. Yet when I enter a last initial in the To field, only our staff names with that last initial appear. I enter the full last name and get "no entries are found" yet the person IS in my Contacts.
I have to send to multiple people (a press list) and so entering the full e-mail address of all those people is just not an option.
Thoughts?
Thank you.
Power Mac G5   Mac OS X (10.3.9)  

Answer 1

Here is the explanation of how to use the Stylish extension to apply a style rule change to a web page. The other way to apply a custom style rule to a page is a userContent.css file. Since Stylish makes tweaking and previewing easy, I'll describe that method.
(1) Install Stylish and restart Firefox. (If you already have Stylish, skip to step 2.)
https://addons.mozilla.org/firefox/addon/stylish/
(2) Display the People page that has the problem.
(3) Look for the "S" icon on the Add-ons bar (press Ctrl+/ to display the bar if necessary). Click the icon and choose
Write new style > Blank style...
(4) Copy the following and paste it into the new rule on the large blank area where there is a faded 1 in the left margin:
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("mail.live.com") {
.ContactsListScrollable, .DeletedContactsScrollable {width:325px!important;}
(5) Click the Preview button and watch the effect on the page. Does it work?
''Note: I only tested this on the People page. If that same list appears on other pages, the resizing might actually make it smaller on that page. Let me know if you see that.''
(6) Assuming it worked, go ahead and give your rule a name, such as Outlook Wider Contacts List and click Save.
Stylish has many other uses, since it can modify Firefox's "chrome" (toolbars, menus, etc.) as well as web pages.
Any luck?