If you’re using the New Outlook on a Mac, and your Outlook has upgraded itself to version 16.63 (currently the latest version), then there may be an issue where all of your email signatures disappear.

If you go into the preferences, you’ll be unable to see any signatures, and when you write a new email, there are no signatures to apply.

Microsoft are aware of the issue, and are working on a fix:

Can’t create new signatures in new Outlook for Mac and existing signatures are missing

Microsoft have said that the issue starts after installing Office for Mac 16.63 update. The Outlook team is investigating, and they will update this topic when they have more information about any potential future changes.

In the meantime, a fix that is working for some people is use defaults write to change a setting for Outlook.

Quit Outlook.

Open Terminal

Type in the following and hit Enter

defaults write com.microsoft.Outlook DisableSignatures 0

Next, launch Outlook and check your signatures. If you, like me, hit the + button a heap of times when trying to add a new signature to really, really, really make sure it wasn’t working, then you will have a whole stack of Untitled signatures you will need to delete. Your original signatures should be at the top of the list exactly as they were to start with.

Now, apparently this fix does not work for everyone – if it doesn’t work for you, I’m afraid I don’t have any other things to try at this stage, except maybe try toggling it, e.g.

Quit Outlook

defaults write com.microsoft.Outlook DisableSignatures 1

Launch Outlook

Quit Outlook

defaults write com.microsoft.Outlook DisableSignatures 0

Launch Outlook

To clear this setting completely, type in

defaults delete com.microsoft.Outlook DisableSignatures