Creating an HTML Signature in Outlook 365
We all know Outlook is a right pain the arse, so as you would expect, using HTML in your email signature isn't straightforward.
in Support Articles by Paul
You are going to need:
1. The HTML that you want to use. Either one you've painstakingly created yourself or the file we've sent you.
2. The ability to navigate around the Windows filing system using File Explorer, which is set to "view hidden files", AND to show file extensions.
STEP ONE - CREATE A BLANK SIGNATURE
In Outlook, go to File > Options > Mail and click on “Signatures“. Click "New" to create a new signature and enter a name for it. Remember that name!
Use the option boxes to set your new signature for new messages and replies/forwards etc as you see fit.
Click "OK" to save and "OK" again to exit the options dialogue.
STEP TWO - EDIT THE SIGNATURE FILE
Open file explorer and navigate (on Windows 8/10) to: C:\Users\username\AppData\Roaming\Microsoft\Signatures
Can't find it? Make sure you have selected the option to see hidden files and folders.
You'll see a file called xyz.htm, where xyz is the name you used for your signature in step one. You'll see other files named xyz but you need the one with the htm extension.
Open it with Notepad - you can right-click on it and select "open with > Notepad".
STEP THREE - PASTE IN THE HTML
All that stuff you can see in the file you opened - that's all typical Microsoft junk - get rid of it, and paste in the html code for your signature. Save it (with the same filename of course.. xyz.htm)