Microsoft fixed a bug that prevented some Microsoft 365 users from using Exchange ActiveSync to connect to email servers.
Users can access their email, calendar, contacts, and tasks using Microsoft Exchange’s Exchange ActiveSync ( EAS ), a synchronization protocol.
To communicate and synchronize data between the Exchange server and mobile devices, EAS uses HTTP and XML. EAS is enabled on new user mailboxes by default, and turning it off can prevent users from synchronizing their mobile devices with their mailboxes.
” We need to connect to our cloud-hosted email server using Activesync.” One user report claimed that other syncing might not be impacted.
Outlook only has a known impact for Microsoft 365 users who have clients updated to Version 2401 Build 17231.20182.
Microsoft requests users to install the update by clicking” Update Now” under File >, Office Account >, Update Options, and claims the known issue has been fixed in Version 2402 Build 17328.20068 and higher.
Redmond also provided a temporary fix for Outlook desktop clients, which required restoring Office M365 Click-to-Run installations to an unaffected Office build ( the recommended build is Version 2312 Build 17126.20132 ) or switching to an Office Channel that did n’t have this sync issue.
Re-enable updates by selecting File >, Office Account >, Update Options >, and Enable Updates, the company said today.
After installing the December 2023 Patch Tuesday Office security updates, Microsoft is also looking into an issue that causes security alerts in Outlook when attempting to open.ICS calendar files.
Microsoft fixed a previously unsolved Outlook issue that had caused connection issues for Outlook .com accounts on desktop and mobile devices last month.
Microsoft fixed two additional bugs in December, one of which caused Outlook to crash when emails were sent from Outlook .com accounts and one that affected users with numerous folders.