Using Classic Outlook on Windows for personal email, calendar, and contact management
I am also having this issue....for years.
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When I open any appointment in outlook Calendar I have to save it before closing if I have locked my PC in between. Even If I did not change anything (applies to any invite also empty freshly created ones and also applies when outlook is started in safe mode + also applies on different PC / different account)
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I keep checking back hoping for a resolution.... I have about 800 users wanting a fix.
Make that 801.
MS needs to pull its socks up.