Sender-recipient pair receiving limits in Microsoft Office 365

We are updating our receiving limits in Exchange to help prevent attacks on your mail flow experience. Earlier this year in (February MC239262) we announced a stricter enforcement of our mailbox receiving limits. Taking your feedback into consideration, we are releasing an additional limit to block single-sender mail storms and deter DoS attacks.

Our mailbox receiving limits, as previously stated, apply to the messages received by a Microsoft Office 365 mailbox. If volume exceeds 3,600 messages in a given 60-minute window, the mailbox will no longer accept messages from the Internet, from other tenants, or from on-premises senders.


Outlook on the web – Project Moca migrating to Outlook board view

Thank you for using the public preview (MC224257) of Project Moca! It was a success, and we will begin migrating content from Project Moca to the new Outlook Calendar board view in July. All boards and content will be migrated and users will not lose any data.

This message is associated with Microsoft 365 Roadmap ID 82013.


Microsoft Exchange Online – Configuration Change for online meetings by default

Whether you’re working from home or meeting with people in other locations, we will be making a change so that all meetings created in Outlook will automatically be online to allow everyone to attend. This will rollout on desktop, web, mobile and Mac.

This message is associated with Microsoft 365 Roadmap ID 81995.


Microsoft Defender for Office 365: Creating allows in the Tenant Allow/Block List

We understand that, from time to time, you might disagree with an Exchange Online Protection (EOP) filtering verdict. With this update, you will be able to override filtering verdicts using the Tenant Allow/Block List (TABL) in the Defender portal while your submission is being reviewed.

This message is associated with Microsoft 365 Roadmap ID 70591


Retirement of Discover slab from old Outlook iOS versions

On August 5, 2021, the Recommended slab will be retired from old versions of Outlook iOS. When the change takes effect, the Recommended slab will silently disappear from the search view in Outlook iOS versions older than 4.31.0.

Note: If your organization does not use iOS, you can safely ignore this message.


Microsoft Defender for Office 365: Extending Secure by Default for Exchange Transport Rules (ETRs)

Microsoft believes it’s critical to keep our customers secure by default. We have determined that legacy overrides tend to be too broad and cause more harm than good. As a security service, we believe it’s imperative that we act on your behalf to prevent your users from being compromised. This means these legacy overrides will no longer be honored for email messages we believe are malicious. We already apply this approach with malware messages and now we have extended it to messages with high confidence phish verdicts. We have been taking a very deliberate approach to rolling out these changes in phases to ensure customers are not surprised and there are no negative side effects. We began to rollout Secure by Default for high confidence phishing messages by the override type starting in December 2020 (Roadmap ID 60827). Today, we’re at a point in our Secure by Default journey where the following overrides are not honored for malicious emails (malware or high confidence phish emails):

  •  Allowed sender lists or allowed domain lists (anti-spam policies)
  •  Outlook Safe Senders
  •  IP Allow List (connection filtering)


Microsoft Outlook Extension for Edge recommendation

This new release will enable some Windows 10 users, who are using Outlook on the web or Outlook for Windows, to see a clickable recommendation to visit the browser extension page for Outlook in Edge where they can choose to install the extension. This notification will be displayed in any Windows browser (i.e., Edge, Chrome, Firefox, Internet Explorer, etc.) and in Outlook for Windows.

Note: If you do not want your users to see the recommendations for the new Microsoft Outlook Extension for Edge, you can opt-out of these for your organization.


Microsoft Defender for Office: Updates to investigations

We are improving Microsoft Defender for Office automated investigation email clustering and actions to ensure that actions only occur on malicious emails still in the mailbox. This will result in more accurate threat information, with fewer email actions, and refreshed actions/data.

This message is associated with Microsoft 365 Roadmap ID 82056.


First contact safety tip setting in Anti-Phishing policy

The first contact safety tip that warns users of a suspicious email which could potentially be related to a Business Email Compromise is a feature that exists today (September 2020).

  • It can currently be configured using an Exchange transport rule (ETR) or Mailflow rule.


New Service – Scheduler for Microsoft 365

Scheduler is an add-on service for Microsoft 365 that enables a digital assistant to schedule your meetings through email. Licensed users just have to add the assistant’s email address to an email conversation to delegate the scheduling to the assistant for both, internal and external meetings.

The Scheduler service will be available WW but in English only.


I've been working with Microsoft Technologies over the last ten years, mainly focused on creating collaboration and productivity solutions that drive the adoption of Microsoft Modern Workplace.