Keeper.sh can now read an Outlook calendar, not only write to one. Sign in with a Microsoft account, choose the calendar to read, and its busy time reaches every destination you have set up.
Before this release, Outlook could receive your busy time but not supply it, so a work calendar kept in Outlook could not block time anywhere else. One Microsoft account can now be both ends at once: Keeper.sh reads your work calendar and writes your personal one into the same account.
Google and Outlook now share one sync path, so a fix to how repeating events or timezones are handled lands for both providers at the same time.
Syncing Google Calendar and Outlook walks through a setup between the two.