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Available on winget

Install OOF Manager

Manage Microsoft 365 / Exchange Online Out-of-Office (Automatic Reply) settings without opening Outlook.

Install with winget 
winget install --id tisun2.OofManager
Upgrade 
winget upgrade --id tisun2.OofManager
Uninstall 
winget uninstall --id tisun2.OofManager

About OOF Manager

OOF Manager is a lightweight Windows desktop tool that manages your Microsoft 365 mailbox's Out-of-Office (Automatic Reply) state for you. Sign in once, configure your weekly work hours and reply text, and OOF Manager auto-toggles your OOF on/off at the schedule boundaries. It also pushes the next off-hours window to Exchange as a Scheduled OOF, so the server keeps switching auto-replies even when this app is closed.