Cloud users have experienced a surge in Calendar spam - in which spam emails offering cheap Ray-Bans Ugg Boots or Pandora bracelets contain calendar invitations to make them even more irritating.

Apple's operating systems - iOS and MacOS - scan email inboxes for messages that contain calendar invitations so that you don't have to dig through your emails to find them. When you get an invitation, it pops up as a notification on your phone or tablet.

This is useful for meetings, flights and so on, and lets you see all your notifications in your calendar app. However, it is also being increasingly exploited by spammers offering cheap deals. While spam emails can easily be ignored, or blocked by junk filters, calendar invitations are more visible.

Users are also receiving spam invitations to edit Reminders and view photo groups.

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Invitations are often sent to different email addresses in bulk. One I received claiming to offer 50 per cent off Ugg Boots in a Black Friday sale directed people to "ugg-home.com", which is not the official Ugg website but a scam site registered in Moldova.

It is unclear why there has suddenly been such a rise in these spam calendar notifications. It may be linked to Black Friday, or recent data breaches that have seen hackers steal millions of email addresses.

However, it appears to be fairly widespread, with hundreds of online complaints. The events often run for several days, clogging up calendars.

As well as calendar invitations, users have received spam via invitations to edit Reminder groups - a feature in the Reminders app that allows teams to work on to-do lists together. Spam photo sharing invitations have also cropped up.

A spam calendar invitation.
A spam calendar invitation.