Out of date calendar entries, Outlook 2016, Office 365

A user in our organisation has been experiencing a strange issue with her Outlook calendars/meetings. Using Office 365 with Office 2016. It happens randomly, she will receive calendar entry saying:

"Your meeting was found to be out of date and has been automatically updated"

She hasn't changed anything. Any ideas?
ICT EngineerAsked:
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
ICT EngineerAuthor Commented:
Thanks for that. I see there are the causes listed there in that article and best guidelines but not any way to fix the current issue.
Todd NelsonSystems EngineerCommented:
Check the time zone setting for that user in EXO...

Get-Mailbox | Get-MailboxRegionalConfiguration

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Also, check the time zone and date/time set on that user's computer.
Also you may want to check to see if they have cached exchange mode enabled. I have seen where the OST causes some confusion and is relieved when you uncheck cache exchange mode in the user mail profile. Close outlook. Then re-enable cached exchange mode.

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ICT EngineerAuthor Commented:
Thanks guys, gonna test these out now
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