Title: Legacy Outlook for Mac users may be unable to connect to their Exchange Online mailboxes
User impact: Users may be unable to connect to their Exchange Online mailboxes through Outlook for Mac.
Current status: Our fix deployment has reached nearly 95 percent of the affected environment and we’re continuing to monitor the process to ensure the progress continues. While there isn’t an estimated completion time available yet, we expect that the remaining saturation may take an extended period of time.
Scope of impact: Users on the legacy Outlook for Mac client attempting to access their Exchange Online mailboxes may be impacted.
Start time: Friday, March 15, 2024, at 8:00 AM UTC
Root cause: A recent service maintenance change introduced a code issue that inhibits communication between legacy Outlook for Mac users and the Exchange Online service, which is resulting in the impact.
Next update by: Friday, March 29, 2024, at 1:30 AM UTC
