Subj : Good news email hoarders - Microsoft Outlook will start auto-arch
To   : All
From : TechnologyDaily
Date : Thu Oct 09 2025 14:45:06

Good news email hoarders - Microsoft Outlook will start auto-archiving your 
oldest messages to protect your inbox

Date:
Thu, 09 Oct 2025 13:37:00 +0000

Description:
Outlook will automatically archive your oldest emails once your mailbox hits 
90% capacity.

FULL STORY
======================================================================New 
Outlook auto-archiving springs into action when your mailbox hits 90% 
capacity Existing archiving and data retention policies remain unaffected 
Auto-expanding archives are also on the horizon 

Microsoft will soon start rolling out new threshold-based auto-archiving for 
Exchange Online in a bid to prevent mailbox full errors. 

The feature will work by automatically archiving the oldest items when 
storage capacity reaches capacity, marking a change from time-based archiving 
(like move after two years) as email volume and attachment size continue to 
grow. 

Public cloud customers will see the change in October 2025, with government 
clouds getting the update in November. Outlook will start automatically 
archiving old emails 

The Exchange Team explained in a blog post that the oldest emails would 
become automatically archived once mailbox quota approaches 90%. This comes 
from feedback that users wanted proactive and automated space management 
solutions. 

Microsoft stressed that auto archiving does not replace or interfere with 
companies existing archiving policies  instead, it acts as a failsafe when 
space gets tight. The Never Move to Archive tag will also be honored, keeping 
those emails in the main inbox. 

Auto archiving wont interfere with data deletion and retention policies 
either, because emails will still be stored within the archive. 

However, users will not be able to disable auto-archiving. It is a failsafe 
mechanism to prevent any mail flow disruptions and only gets triggered when 
mailbox utilization crosses 90% (Critical) threshold, the company explained. 

A separate Microsoft roadmap entry, tracked as 395793 , details efforts to 
support auto-expanding archives beyond the normal 100GB quota limit. Rollout 
is imminent, according to the note. 

An October 8 update to the blog post notes that a revised release plan for 
auto-archiving will be communicated in the near future as a result of 
customer feedback. As of the time of writing, the October 7 blog post has not 
been updated. 

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Link to news story:
https://www.techradar.com/pro/good-news-email-hoarders-microsoft-outlook-will-
start-auto-archiving-your-oldest-messages-to-protect-your-inbox


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