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Microsoft investigates classic Outlook sync and connection issues

ID: 9fcf2456-3b40-5059-9a44-6a448e08c9d7

STIX ID: report--9fcf2456-3b40-5059-9a44-6a448e08c9d7

Feed Name: Bleeping Computer

Date Published: 2026-03-13

Date Updated: 2026-04-20

Author: Sergiu Gatlan

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Microsoft published a support notice for multiple non-security bugs in the classic Outlook desktop client: group creation failures when Exchange Web Services and AAD Graph interactions fail, Gmail/Yahoo synchronization errors (0x800CCC0F / 0x80070057) after password changes, and a disappearing mouse pointer affecting some Microsoft 365 apps; Microsoft recommends using the new Outlook or OWA, registry workarounds for identities, submitting diagnostics, and opening support cases while fixes are developed.

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