27 feb 2021

Announcing Windows Server Preview Build 20298 aka Windows Server 2022

Announcing Windows Server Preview Build 20298 


Hello Windows Insiders!

Today we are pleased to release a new build of the Windows Server Long-Term Servicing Channel (LTSC) Preview that contains both the Desktop Experience and Server Core installation options for Datacenter and Standard editions.




Available Content


  • Windows Server Long-Term Servicing Channel Preview is available in ISO format in 18 languages, and in VHDX format in English only.  The following keys allow for unlimited activations:
    • Server Standard: MFY9F-XBN2F-TYFMP-CCV49-RMYVH
    • Datacenter: 2KNJJ-33Y9H-2GXGX-KMQWH-G6H67
  • Windows Server Language Pack/Core App Compatibility FoD Preview


Keys: Keys are valid for preview builds only. After activation for the preview keys is disabled, you may still install and use preview builds for development and testing purposes without activating.

Symbols:  available on the public symbol server – see Update on Microsoft’s Symbol Server blog post and Using the Microsoft Symbol Server

Expiration: This Windows Server Preview will expire October 31, 2021.


Known Issues


Shutdown Event Tracker is displayed every time a user logs on even when the user is a member of the administrators group and the user has closed the tracker window properly.

Auto Logon does not work correctly in some scenarios.


How to Download 


Registered Insiders may navigate directly to the Windows Server Insider Preview download page.  If you have not yet registered as an Insider, see GETTING STARTED WITH SERVER on the Windows Insiders for Business portal.

Original post
Announcing Windows Server Preview Build 20298 - Microsoft Tech Community

14 feb 2021

Microsoft 365: Dynamic Delivery in Safe Attachments policies

The Dynamic Delivery action in Safe Attachments policies seeks to eliminate any email delivery delays that might be caused by Safe Attachments scanning. The body of the email message is delivered to the recipient with a placeholder for each attachment. The placeholder remains until the attachment is found to be safe, and then the attachment becomes available to open or download.

If an attachment is found to be malicious, the message is quarantined. Only admins (not end-users) can review, release, or delete messages that were quarantined by Safe Attachments scanning. For more information, see Manage quarantined messages and files as an admin.

Most PDFs and Office documents can be previewed in safe mode while Safe Attachments scanning is underway. If an attachment is not compatible with the Dynamic Delivery previewer, the recipients will see a placeholder for the attachment until Safe Attachments scanning is complete.

If you're using a mobile device, and PDFs aren't rendering in the Dynamic Delivery previewer on your mobile device, try opening the message in Outlook on the web (formerly known as Outlook Web App) using your mobile browser.

Here are some considerations for Dynamic Delivery and forwarded messages:

  • If the forwarded recipient is protected by a Safe Attachments policy that uses the Dynamic Delivery option, then the recipient sees the placeholder, with the ability to preview compatible files.

  • If the forwarded recipient is not protected by a Safe Attachments policy, the message and attachments will be delivered without any Safe Attachments scanning or attachment placeholders.

There are scenarios where Dynamic Delivery is unable to replace attachments in messages. These scenarios include:

  • Messages in public folders.

  • Messages that are routed out of and then back into a user's mailbox using custom rules.

  • Messages that are moved (automatically or manually) out of cloud mailboxes to other locations, including archive folders.

  • Deleted messages.

  • The user's mailbox search folder is in an error state.

  • Exchange Online organizations where Exclaimer is enabled. To resolve this, see KB4014438.

  • S/MIME) encrypted messages.

  • You configured the Dynamic Delivery action in a Safe Attachments policy, but the recipient doesn't support Dynamic Delivery (for example, the recipient is a mailbox in an on-premises Exchange organization). However, Safe Links in Microsoft Defender for Office 365 is able to scan Office file attachments that contain URLs (depending on how the global settings for Safe Links are configured).