Calendar Problems

How to Recover Missing Calendar Appointments After Renaming an Outlook Mailbox

Bushra Parveen Oct 15, 2026 869 views

Question details

Calendar appointments disappeared after changing the Outlook mailbox name from an information address to a new name.

How to Recover Missing Calendar Appointments After Renaming an Outlook Mailbox

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Renaming an Outlook mailbox or updating the primary email address.
Observed behavior: The calendar associated with the renamed mailbox appears completely empty, with all previous appointments and events missing.

Before you start

Verify whether your IT administrator simply renamed an existing email alias or if they created an entirely new mailbox profile, as this dictates where your original calendar data is stored.

Solution 1Recommended

Recover Appointments by Opening the Original Outlook Data File

If a new mailbox was created instead of renaming the old one, your appointments are still safely stored in the original .pst or .ost data file on your computer.

Calendar appointments in Microsoft Outlook are fundamentally tied to the mailbox and its specific data file. When an account is recreated rather than renamed, Outlook generates a fresh, blank calendar.

You can usually retrieve these missing appointments by locating the previous data file and copying the calendar items over.

Locate Your Original Data File

Open Outlook, navigate to File > Account Settings > Account Settings, and click the Data Files tab to see if your old data file is still listed.

Open the Old Outlook Data File

Go to File > Open & Export > Open Outlook Data File.

Select the File

Browse to your Documents\Outlook Files or AppData\Local\Microsoft\Outlook folder, select your previous mailbox's data file (.pst), and click OK.

Copy the Appointments

Navigate to the Calendar view, check the box next to your old calendar in the left pane, change the view to 'List', select all items (Ctrl+A), and drag or copy them to your new active calendar.

Recover Appointments by Opening the Original Outlook Data File

Data File Types: Exchange accounts use .ost files which might require reconnecting to the original Exchange server profile to export properly, whereas POP/IMAP accounts typically use .pst files that can be opened directly.

Solution 2

Switch Back to the Original Mailbox Profile

If you have multiple profiles configured on your computer, you can temporarily switch back to the original profile to access and export your calendar data.

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Frequently Asked Questions

Why did my calendar appear empty after my mailbox was renamed?

When an IT administrator creates a completely new mailbox instead of adding an email alias to your existing one, Outlook generates a fresh, blank calendar. Your old appointments are still safely stored in the original mailbox's data file.

Are my missing Outlook calendar appointments permanently deleted?

No, they are rarely permanently deleted. The appointments are still securely stored in your original Outlook data file (.pst or .ost) on your local hard drive or on the Exchange server under your previous account configuration.

How do I find my old Outlook data files on Windows?

By default, Outlook saves data files in 'C:\Users\[YourUsername]\Documents\Outlook Files' or 'C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook'. You can access and open them directly through the File > Open & Export menu in Outlook.

Can I merge my old calendar appointments into my new calendar?

Yes. Once you open the old data file in Outlook, change your calendar view to 'List', select all the previous appointments using Ctrl+A, and simply drag or copy them into your newly generated mailbox calendar.

Outlook & Email Problems