Outlook shared calendar shows outdated free busy data

Scenario

Users can open a shared calendar, but availability data lags behind reality and meeting scheduling becomes unreliable.

Recommended Resolution Path

1. Verify the issue exists in Outlook on the web to distinguish client cache from mailbox data.
2. Check organization relationship, mailbox permissions, and whether the shared mailbox was converted recently.
3. Clear local Outlook cache for shared folders and restart the client.
4. Confirm time zone and autodiscover health before escalating as an Exchange service issue.

Technician Notes

Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.