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Microsoft: Outlook clients not syncing over Exchange ActiveSync

ID: d981ea65-0647-52cf-93a3-6f5e6e6928e3

STIX ID: report--d981ea65-0647-52cf-93a3-6f5e6e6928e3

Feed Name: Bleeping Computer

Date Published: 2024-02-09

Date Updated: 2026-04-20

Author: Sergiu Gatlan

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Microsoft advised that Outlook for Microsoft 365 may stop connecting to email servers via Exchange ActiveSync after updating to Version 2401 Build 17231.20182; affected users can temporarily restore functionality by reverting to Version 2312 Build 17126.20132 or switching update channels while a fix is being developed, with additional notes on other recent Outlook issues and resolutions.

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