Microsoft 365 and Google Workspace

Microsoft 365

Sign in with Microsoft — when the platform switches it on, everyone can sign in with their Microsoft work account (same email as in BusinessHRM).
Outlook calendar — Settings > Connected apps > Microsoft 365 > Connect Outlook. Sign in with the account whose calendar to use (a shared mailbox works well), choose what to put on it (approved leave, holidays, interviews) and which calendar, Save, then Sync now.
Leave shows as all-day "out of office" events; reasons are never shared. Changes and cancellations update or remove the event.

Sign in with Google and Google Calendar (leave, holidays, tasks, events…) keep working as before — see Google Calendar Settings.
Settings > Connected apps > Google Workspace adds interviews to the same Google calendar (switch on, Save, Sync now).