嗯，用户让我总结一下这篇文章的内容，控制在一百个字以内。首先，我需要通读整篇文章，抓住主要信息。 文章主要讲的是微软在调查Exchange Online的邮箱访问问题，这个问题已经持续几周了，影响了Outlook移动端和macOS用户。微软最初提到这个问题是在上周，问题开始于3月11日，原因是引入了一个新的虚拟账户。虽然他们声称在4月1日已经解决，但问题又出现了，用不同的标签重新添加到了管理消息中心。 微软现在正在努力重启Notification Broker服务，并继续分析根本原因。问题可能仍然会间歇性影响一些用户。最新的更新是周四晚上发布的，团队还在调查根本原因，并采取措施防止再次发生。 此外，文章还提到微软最近处理了其他几个Exchange Online的问题，比如阻止用户通过Outlook网页版访问邮箱和日历的问题，以及Office.com和Microsoft 365 Copilot的登录问题。还有一个关于IMAP4协议的问题在1月份解决过。 总结下来，文章主要描述了微软正在处理Exchange Online的持续访问问题，并提到了之前的一些相关问题。所以，在总结的时候需要涵盖这些问题的时间、影响范围以及微软的应对措施。 接下来，我要把这些信息浓缩到100字以内。要注意不要使用“文章内容总结”这样的开头词，直接描述内容即可。 可能会写成：微软正在调查Exchange Online邮箱访问问题，该问题已持续几周，影响Outlook移动端和macOS用户。初步归因于新虚拟账户引入的问题，在4月1日标记为解决后又重新出现。目前仍在分析根本原因，并采取措施防止再次发生。 这样应该控制在100字以内，并且涵盖了主要的信息点。 </think> 微软正在调查Exchange Online邮箱访问问题，该问题已持续几周，影响Outlook移动端和macOS用户。初步归因于新虚拟账户引入的问题，在4月1日标记为解决后又重新出现。目前仍在分析根本原因，并采取措施防止再次发生。 2026-4-3 11:30:18 Author: www.bleepingcomputer.com(查看原文) 阅读量:5 收藏
Microsoft is investigating and working to resolve Exchange Online mailbox access issues that have intermittently affected Outlook mobile and macOS users for weeks.
When it first acknowledged this service issue (tracked under EX1256020) last week, Microsoft said it started on March 11 and that the root cause was a newly introduced virtual account. While the company flagged it as resolved on April 1, the incident has been re-added to the admin message center under a different tag (EX1268771).
"We've received reports from affected tenants that the impact scenario originally communicated through SHD EX1256020 is still ongoing. We're working to restart the Notification Broker service on affected portions of Exchange Online service infrastructure to remediate impact while we continue our analysis into the underlying root cause," Microsoft says.
"Impact may occur intermittently for some users accessing their Exchange Online mailboxes in the Outlook mobile apps or the new Outlook for Mac desktop client. This section may be updated as our investigation progresses."
In the latest update issued on Thursday evening, the Exchange Online team said it's still investigating the root cause and working on additional measures to prevent this issue from recurring.
While Microsoft has yet to share which regions or how many users have been affected by this issue over the last three weeks, it flagged this as an incident, which typically applies to critical service issues with noticeable user impact.
Earlier this month, Microsoft mitigated an Exchange Online outage that prevented users from accessing mailboxes and calendars via Outlook on the web, Outlook desktop, Exchange ActiveSync, and other Exchange Online connection protocols.
The same day, it fixed a separate issue that caused Office.com or Microsoft 365 Copilot web sign‑in problems affecting the Microsoft Copilot desktop app, Copilot in Microsoft Teams, and Copilot in Office apps.
Another Exchange Online service outage that intermittently blocked email via the Internet Mailbox Access Protocol 4 (IMAP4) was addressed in January, while a similar incident blocked Exchange Online access via the classic Outlook desktop client in November.
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