Robert 365

Latest updates, features, fixes and issues for Classic Outlook (mid-April 2026)

It’s mid-April and the monthly Security Updates and bug-fixes have been released! A recap of the month so far.

This month, there were no security fixes for Classic Outlook for Windows but there were 12 for other Office application.

There weren’t a lot of documented fixes across any of the release Channels this time. Maybe the most disruptive change is that the Semi-Annual Enterprise Channel (SAEC) will merge into the Monthly Enterprise Channel in July 2026.

The most notable new issue is that Auto-Translate stopped working. The issue which prevents you from creating new Microsoft 365 Groups is still around. However, the issue where the “My Templates” add-in was missing from Outlook has been fixed again but may require action from your tenant-admin as well.

This guide provides a quick overview of all the latest fixes, new features, persistent bugs, security vulnerabilities and other changes across all Classic Outlook for Windows versions.

► Continue reading: Latest updates, features, fixes and issues for Classic Outlook (mid-April 2026)

How to backup New Outlook Account Configuration and Mailbox Data

New Outlook’s mailbox storage and management is significantly different than Classic Outlook, which also impacts your backup and restore strategy.

There are still limitations in New Outlook which could make it impossible to restore a seemingly good backup.

Knowing how to properly backup and restore your account configuration and data of New Outlook will make sure you can quickly get yourself up and running again in case you need to reset New Outlook, switch to a new PC, or when something happens to your data.

► Continue reading: How to backup New Outlook Account Configuration and Mailbox Data

How to create multiple Mail Profiles in New Outlook

New Outlook allows you to create multiple Mail Profiles which each having its own account configuration and cache, just like Classic Outlook.

However, Mail Profiles in New Outlook work significantly different from Classic Outlook as there is no interface for it, it works command line based, and New Outlook doesn’t make it clear how and where the Mail Profiles are saved and managed.

Learn all about how to create and manage Mail Profiles in New Outlook with the info and step-by-step instructions within this guide.

► Continue reading: How to create multiple Mail Profiles in New Outlook

Microsoft forgets Classic Outlook with new Office apps icon refresh

After a recent update, all my Office apps now show the new icons except for Classic Outlook.

Did Microsoft really forget about Classic Outlook and only gave New Outlook an icon refresh?

► Continue reading: Microsoft forgets Classic Outlook with new Office apps icon refresh

What Windows 10 End of Support means for Outlook

Now that Windows 10 has ran out of support (14 October 2025), what does this mean for Outlook support?

► Continue reading: What Windows 10 End of Support means for Outlook

Power Automate: Mail Merge with Outlook Contacts

Even though Classic Outlook has a Mail Merge feature itself, sending Mail Merges via Power Automate offers more flexibility and advanced features such as adjusting the From field, using HTML formatting and adding attachments. It can also act as an alternative to the very limited Mail Merge capabilities of New Outlook.

As Power Automate runs within the Microsoft 365 Cloud, sending out a large Mail Merge this way is fast and doesn’t block Outlook or hinder your computer’s performance while running.

Starting with Power Automate may be overwhelming at first, but setting up a Mail Merge is a much more straightforward and easier task than you might think.

In this tutorial, we’ll take a step-by-step approach to construct a Mail Merge in Power Automate which uses your Outlook Contacts folder as the data source and use a Categories filter to restrict who will receive your personalized email.

► Continue reading: Power Automate: Mail Merge with Outlook Contacts

Command line switches for New Outlook (including secret ones!)

Command line switches for New Outlook are very different from the ones that are available for Classic Outlook. Even how they work is different.

The main intention of the currently available command line switches for New Outlook is troubleshooting and less focused on supporting (automation) workflows.

Nevertheless, it is good to know which are available and how to use them. Microsoft has documented a few, but there are a couple useful hidden ones as well which are also covered in this guide.

► Continue reading: Command line switches for New Outlook (including secret ones!)

Prevent reminder overload: Enable reminder icons in Calendar!

When planning my day in the Calendar, I usually only set reminders on items for which I need to prepare something in advance or when it is an actual meeting rather than a blocked timeslot.

By default, reminders are set on all calendar items (which I like!) and I’m pretty good with removing or adjusting the reminder when needed. However, when planning my day, I want to double check that to prevent getting an insane amount of reminder pop-ups during the day.

Currently, this is quite a tedious process, especially on days with a lot of small to do’s planned, as it requires me to select each item on my Calendar.

Is there a way to quickly see which items on my Calendar have a reminder enabled and which don’t?

► Continue reading: Prevent reminder overload: Enable reminder icons in Calendar!

Resetting New Outlook; 3 methods to guarantee success!

I switched to New Outlook and it automatically configured various accounts. However, some of these accounts I don’t even use anymore or are giving me issues. At one time, upon trying to fix these accounts, it took several attempts before New Outlook even started again.

I’d just like to start over without these automatically migrated accounts and settings.

In Classic Outlook, I could recreate my Mail Profile to achieve this. How can I recreate my Mail Profile in New Outlook?

► Continue reading: Resetting New Outlook; 3 methods to guarantee success!

Exchange 2019 CU15

Cumulative Update 15 for Exchange 2019 is now available. It is officially called; The 2025 H1 Cumulative Update (CU) for Exchange Server 2019.

This is the last CU update for Exchange Server 2019 and is code equivalent to the RTM release of Exchange Server SE, which will be released early in the third quarter of 2025.

Exchange 2019 CU15 includes the following major changes;

Support for Windows Server 2025
You can install Exchange 2019 CU15 on a new server running Windows Server 2025, and then perform an in-place upgrade to Exchange Server SE.
CU14 has been retroactively validated for this scenario as well.
Partial TLS 1.3 support for Exchange Server 2019
When using Windows Server 2022 or later, TLS 1.3 is now enabled by default for all protocols except SMTP.
Certificate management tasks restored to EAC
At long last, renewing, importing, exporting and other certificate tasks can be performed via the Exchange Admin Center again, and not just via PowerShell.
Feature Flighting in Exchange Server
The inclusion of Feature Flighting is in preparation for Exchange Server SE, and doesn’t have an actual function for Exchange 2019.
OIT module in Exchange Server is replaced by DocParser
Instead of Oracle’s Outside In Technology, Exchange will now use Microsoft DocParser. This is used for text extraction when processing email attachments for Data Loss Prevention and Exchange Transport Rules.

There are 12 additional fixes documented for this release. A few notable ones are;

KB5047359: Clean up old Exchange OWA files automatically to free up disk space
KB5047361: Inline images and text attachments are not visible in OWA
KB5047402: Online Archiving bypasses the InternetWebProxy setting in Exchange 2019
KB5048017: RecoverServer operation fails in Exchange Server 2019
KB5048020: Calendar print doesn’t work in OWA from Exchange 2019 CU14 onwards
KB5047994: German umlauts in the Subject are replaced by a question mark

This release does not include new updates to the Active Directory Schema for Exchange 2019.

Exchange 2019: CU15 KB5042461 – Download
View: Blog post of the Exchange Team about CU15 for Exchange Server 2019