Microsoft recently announced that it would block more attachment file types for New Outlook for Windows and Outlook for the Web. The company said that it is doing so in order to improve the security of its mail app.
Another change Microsoft announced this week regarding attachments is better offline support for such files on its New Outlook for Windows app. The company announced it on the Microsoft 365 (M365) roadmap website under a new message ID 496371. In the description of the message headlined "Outlook: add attachments while offline in the new Outlook for Windows", the tech giant writes:
"We are adding more functionality to offline mode in the new Outlook for Windows. You will now be able to add attachments while drafting your email without an internet connection." Not much else has been stated, though the entry does reveal that Microsoft expects to start rolling it out next month, July 2025. You can find the M365 roadmap message here.
This is the second time offline support for attachment files is receiving an upgrade. In December 2024, Microsoft added the ability to "open attachment files" without an internet connection.
The tech giant has been trying to improve offline operation on its New Outlook app for a while. Last month, Microsoft also added offline Calendar support so that internet connectivity is not necessary. The idea is to try to get more users to switch from the Classic app to the New one.
Speaking of classic Outlook, Microsoft recently confirmed that a major Calendar feature upgrade has led to several bugs on the classic app, as it breaks in many ways. If you are someone experiencing problems with it, check out this dedicated article, as Microsoft has provided workarounds for several issues.