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Volume 30 Issue 32

Slipstick Systems

Issue Date: October 16, 2025 « Previous Issue | Next Issue »

The following articles were included in our Exchange Messaging Outlook (EMO) newsletter published on October 16, 2025.

EMO is a weekly publication. To receive your own copy of EMO by email, subscribe here.

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Today's Highlights »

  • The Day the Software Died
  • Display Meeting Details in the Calendar?
  • New Office Icons

The Day the Software Died

Two applications died this week: The OneNote for Windows app and legacy Outlook for Mac. Both applications stopped working. Users need to use the OneNote Win32 application that is part of Office or available from the Microsoft store if you don't have a license for Office.

If you don't have Office, you can still use OneNote but need to download it from OneNote - Download and install on Windows. (It’s free.)

If you missed the warnings from Microsoft and did not switch over to OneNote yet, no worries. All notebooks are in your OneDrive account. Open OneNote and sign in to your account and open the notebooks.

In additional those apps, Windows 10 and Exchange 2016 / 2019 also reached their “end of life” this week but were not killed off. They still work but won’t get security updates after this week.

If you purchased Consumer Extended Security Updates (ESU) option for Windows 10, you’ll get security updates for one year. This option was made available for consumers but many users (including many of my clients) were not offered the extended support option.

If you do not have ESU, Windows will continue to work but will not receive security updates. If your computer cannot upgrade to Windows 11, there is no rush to upgrade your hardware, but I expect some good sales this holiday season.

Support for Exchange Server 2016 and Exchange Server 2019 ends today | Microsoft Community Hub

End of support for legacy Outlook for Mac

Display Meeting Details in the Calendar?

A Microsoft 365 user wanted to know if it was possible to show the meeting details in the calendar view, to eliminate the need to open the meeting to check.

It depends on which Outlook. Classic Outlook will show the location and organizer in the day / week views, provided the meeting spans enough time slots. For one hour meetings, you need to use the 30-minute time scale; for 30-minute meetings, use 15-minute scale. The monthly calendar doesn't have enough room to show more than the subject and start and end times.

New Outlook and Outlook on the web will show the subject and organizer in the day and week views (depends on the time scale), but not the location.

In all versions of Outlook:

If you click on the meeting, you’ll see more information in the meeting card that pops up.

If you want to see who was invited, you’ll need to open the meeting,

If you’re viewing a shared calendar, your permissions will determine how much information you see, even in an opened meeting form.

New Office Icons

Microsoft is rolling new icons for Office applications. Microsoft 365 icons on my MacBook updated this week but my Windows desktop still has the old icons. New Outlook’s icon is not changing, and I believe classic Outlook will keep its current icon.

I haven't seen too many people who like the new icons. I’m not sure why, they aren’t that much different – just rounded corners.

The new icons will be in Microsoft 365 subscriptions and may eventually make it into Office 2024 and 2021.

New & Updated Microsoft 365 & Exchange Server Support Articles

Auth Certificate export through Exchange cmdlet is no longer supported

Description of the security update for Microsoft Exchange Server 2019 CU15: October 14, 2025 (KB5066367)

Description of the security update for Microsoft Exchange Server 2019 CU14: October 14, 2025 (KB5066368)

Description of the security update for Microsoft Exchange Server 2016 CU23: October 14, 2025 (KB5066369)

New & Updated Outlook Support Articles

Inbox shows incorrect number of unread items in Outlook for Mac

Known issues with classic Outlook Desktop Shared Calendar Improvements

Microsoft Editor is not available in new Outlook for GCC tenants

Outlook GPO Update for “When sending a message” policy

Other Resources

Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server Retirement | Microsoft Community Hub

Released: October 2025 Exchange Server Security Updates | Microsoft Community Hub

Volume 30 Issue 32 was last modified: October 17th, 2025 by Slipstick Systems

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Recent Bugs List

Microsoft keeps a running list of issues affecting recently released updates at Fixes or workarounds for recent issues in classic Outlook (Windows).

For new Outlook for Windows: Fixes or workarounds for recent issues in new Outlook for Windows .

Outlook for Mac Recent issues: Fixes or workarounds for recent issues in Outlook for Mac

Outlook.com Recent issues: Fixes or workarounds for recent issues on Outlook.com

Office Update History

Update history for supported Office versions is at Update history for Office

Outlook Suggestions and Feedback

Outlook Feedback covers Outlook as an email client, including Outlook Android, iOS, Mac, and Windows clients, as well as the browser extension (PWA) and Outlook on the web.

Outlook (new) Feedback. Use this for feedback and suggestions for Outlook (new).

Use Outlook.com Feedback for suggestions or feedback about Outlook.com accounts.

Other Microsoft 365 applications and services




New Outlook Articles

Sync Issues and Errors with Gmail and Yahoo accounts

Error Opening iCloud Appointments in Classic Outlook

Opt out of Microsoft 365 Companion Apps

Mail Templates in Outlook for Windows (and Web)

Urban legend: Microsoft Deletes Old Outlook.com Messages

Buttons in the New Message Notifications

Move Deleted Items to Another Folder Automatically

Open Outlook Templates using PowerShell

Count and List Folders in Classic Outlook

Google Workspace and Outlook with POP Mail

Newest Code Samples

Open Outlook Templates using PowerShell

Count and List Folders in Classic Outlook

Insert Word Document into Email using VBA

Warn Before Deleting a Contact

Use PowerShell to Delete Attachments

Remove RE:, FWD:, and Other Prefixes from Subject Line

Change the Mailing Address Using PowerShell

Categorize @Mentioned Messages

Send an Email When You Open Outlook

Delete Old Calendar Events using VBA

Repair PST

Convert an OST to PST

Repair damaged PST file

Repair large PST File

Remove password from PST

Merge Two Data Files

Sync & Share Outlook Data

  • Share Calendar & Contacts
  • Synchronize two computers
  • Sync Calendar and Contacts Using Outlook.com
  • Sync Outlook & Android Devices
  • Sync Google Calendar with Outlook
  • Access Folders in Other Users Mailboxes

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