One is when people send notice of their annual leave as an Outlook invite and mark it ‘show as: out of office’ such that it then also blocks out a fortnight in the diary of everybody they sent it to.
I know how to change it on my end but nobody else seems to, so I’ll be searching for a good meeting time and all I can see is 15 people all supposedly on holiday.
What trivial things wind you up about incorrect and/or less ideal use of IT?