Our company uses Windows Live Calendar as a shared calendar for posting work orders to our crew.

One of our crew members receives multiple (10+) notices about some events. Sometimes, it's just a single notice.

I can't figure out WHY this is happening. It is only happening to one person in the group.

I think it may be related to settings on his phone or in his desktop Outlook?

He has an iPhone 6+ and is using Outlook 2010 on his desktop.

I can't replicate the problem because it appears to happen randomly.

Does anyone have any idea what the issue might be?

Thanks!