The following articles were included in our Exchange Messaging Outlook (EMO) newsletter published on December 4, 2025.
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Too Many Calendars?
I’m often asked how to get rid of the extra calendars that show up in Outlook when you add an account.
If you are using new Outlook, you cannot remove the calendars. You can uncheck them in the Calendar list so events on that calendar don’t display but they cannot be removed from new Outlook.
If you are using classic Outlook, you can remove “Calendar (This computer only)" in IMAP mailboxes or calendars in PST files but not calendars in Microsoft Exchange accounts (including outlook.com). You can create a new calendar group and move the extra calendars to the new group, then collapse it.
To create a new calendar group, right click “My Calendars” group and choose “New Calendar Group” from the menu. Enter a name for the group (I name it ‘Don’t Use’) then drag the extra calendar folders to it. If one of the calendars you don't use is the default calendar in your default data file, don’t move it to the new group as it’s likely to get moved back to My Calendar and selected.
If you need to remove a “(This computer only)" calendar and it is not in your default data file, you can either delete (or rename) the data file and let Outlook resync the mailbox, or delete the folder using MFCMAPI, PowerShell, or VBA, but it may come back if you receive a meeting invitation sent to that email address. If you remove the account from Outlook and add it back, the “Calendar (This computer only)" folders won't be created (as long as a different data file is set as default data file) and rarely come back when you receive a meeting request. If you have events in the calendar, or contacts in the “Contacts (This computer only)" folder, move or export them before you delete the OST file or remove the account from Outlook!
To rename an IMAP data file, right click on the account name in the folder list and choose "Open File Location". This opens File Explorer with the IMAP data file selected. Close Outlook and add old to the file name or delete it.
See How to Hide or Delete Outlook's Default Folders for steps to delete a calendar using MFCMAPI, PowerShell, VBA for either IMAP accounts or PST files.
Keep both Outlook apps?
A user wanted to know if he should keep both classic and new Outlook installed: “I got a new laptop with Microsoft 365. I now have Classic and the new Outlook. Can I delete one of these?”
If you are not using new Outlook, you could uninstall it, but I usually tell clients to unpin it from the Windows task bar and leave it installed. It doesn't take up a lot of space and future updates may reinstall it. Unpinning it gets it out of sight, so you don't accidentally open it. If you really want to remove it, open Windows Settings > Apps > Installed apps. Find Outlook, click on it then choose Uninstall.
Classic Outlook is part of the Microsoft 365 suite, and you’d need to uninstall Microsoft 365 then use ODT (Office Deployment tool) to install Office without Outlook. However, currently, Word and Excel’s Send by email function uses classic Outlook as does Word’s Mail Merge. If you use those features, you need classic Outlook installed.
Bug: Double Spaced Signatures
There is a bug in new Outlook and Outlook on the web where the signatures are double spaced. Microsoft is aware of the issue and it should be fixed soon.
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