​Microsoft has mounted a recognized situation affecting Outlook for Microsoft 365 customers that brought about issues sending emails for these with too many nested folders.
When it first acknowledged the email-sending points in December, the corporate linked them to an older drawback associated to mailboxes with greater than 500 shared folders—a restrict eliminated in 2019. Nevertheless, Redmond now believes the problem additionally impacts customers with the same variety of folders of their main mailbox.
Microsoft says customers making an attempt to ship emails from the Outlook desktop app might obtain an sudden Non-Supply Report (NDR) with the 0x80040305 error code.
“This situation is just like the prior 500 folder restrict that the Outlook Workforce mounted, Lifting the five hundred Folder Restrict in Outlook,” the corporate mentioned. “That answer focused shared folders however didn’t embody the state of affairs occurring within the person’s main mailbox.”
Affected customers may also be notified that their emails didn’t attain “some or all” recipients, with the NDR message advising them to resend it later or contact their community administrator.
The Outlook Workforce has developed a repair for this drawback, which shall be rolled out to the next launch channels later this month or in December:
- Beta Channel: Model 2410 (Construct 18127.15020), anticipated early October 2024
- Present Channel Preview: Model 2410 (Construct 18129.20000), anticipated October 9, 2024
- Present Channel: Model 2410 (Construct 18129.20000), anticipated October 29, 2024
- Month-to-month Enterprise Channel: Model 2410 (Construct 18129.20000), anticipated December 10, 2024
Workaround additionally obtainable
Within the meantime, till the affected customers’ software program is mounted, Microsoft offers a short lived workaround requiring them to scale back the variety of folders with subfolders to beneath 500, aiming for 450 nested folders.
One other non permanent answer to those Outlook email-sending issues is to maintain all mailbox folders collapsed quite than expanded.
“If you cannot do both of the above, keep away from subsequent on-line actions in Outlook. Such actions embody utilizing the buttons for ‘View on Server’ and ‘Click on right here to view extra on Microsoft Trade,’ or use of ‘Embrace older outcomes’ when looking,” Microsoft mentioned.
“When you use any of those actions, restart Outlook instantly for greatest efficiency.”
Earlier this month, the corporate additionally addressed a bug inflicting Microsoft 365 apps like Outlook, Phrase, Excel, and OneNote to crash whereas typing or spell-checking a textual content.
In August, Microsoft additionally shared non permanent workarounds for recognized points triggering Gmail sign-in points for traditional Outlook customers and inflicting Outlook to crash after opening.
