How to delete subscriptions

You don't. Just leave the list alone as it does nothing. Maybe one day Microsoft will allow users to delete items from there.

Sorry, Senora.  I have not received junk or spam mail yet. 

Each entity in my Subscription list is a legitimate correspondent. 

Perhaps Google will appreciate your "free" services...

Microsoft itself is phishing.  Have you considered this?

The problem is not junk mail.  The problem is Microsoft collecting information regarding our business contacts without our knowledge.  We cannot delete or edit the entries.

Dear GwynBell

I am an independent advisor, and I am trying to help other users in Community with my experience in Microsoft products.

Spammers are using malformed addresses and scripts that are subscribing email address automatically whenever that email reaches inbox. It is hard to dealt with that form of spam. I would suggest not to try unsubscribing, as that notifies the spammers that the Inbox is active and they can start sending more spam. I encourage you to submit the feedback here https://outlook.uservoice.com/forums/284136-out... so maybe at some point developers will make some changes,

As for Junk in general, there are couple of ways to deal with scammers and unwanted emails and improve how your anty filter will work (I am sure that you are aware of some and you are using them, but maybe additional information in support articles will help you):

1. First of all check your spam filters and see suggestions on how to keep spam out of your inbox https://support.office.com/en-us/article/help-k...
2. Report the phishing, spam and unwanted emails https://support.office.com/en-us/article/deal-w...
3. Add emails or domains to block sender (those that were actually used to send emails - see #5) list https://support.office.com/en-us/article/block-...
4. Create specific rules for subjects or common phrases that are present in those emails https://support.office.com/en-us/article/use-in... and add conditions, that are common for those emails, for example additional keywords, recipient address includes etc.
5. Nowadays some scammers have learned how to mask their emails addresses that you can see in the emails. However, in the message source you will find the real one (and the real domain) In order to view message source please check this article https://support.office.com/en-us/article/receiv...
6. You can also use the option at the bottom https://outlook.live.com/mail/options/mail/junk... to receive only trust email from addresses in my Safe senders and domains list and Safe mailing lists

You can also check tips on how to stay safe online from Microsoft https://www.microsoft.com/en-us/digital-skills/...

Hope this will help your email free from Junk!