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