For many Outlook users, the calendar is their command center, it helps them keep track of appointments, deadlines, and the delicate balance between work and personal life. But what if there was a way to manage your schedule even more effectively? For that, you can migrate Outlook calendar to Office 365. Doing so unlocks a powerful suite of features designed to streamline your organization and collaboration.
Benefits of Migrating Outlook Calendar to Office 365
- Create and Manage Multiple Calendars – It helps you organize your schedule with separate calendars for work, personal life, or specific projects.
- Share and Collaborate – See other people’s calendars and share your own to easily schedule meetings and avoid conflicts.
- Track Appointments and Events – You can add appointments, meetings, and reminders to your calendars and keep track of important dates.
After the users’ Inbox folder, the calendar is possibly the place where Outlook users spend most of their time. Users can perform different operations on a calendar, which are as follows:
- Schedule appointments
- Generate multiple calendars
- Apply categories as well as reminders
- Organize the schedule
- Multiple-day appointments can also be created
- Calendars can also be printed
How to Migrate Outlook Calendar to Office 365 Mailbox?
To upload the calendar, you need to create the .ics files first. To do so, follow the below steps:
How to Get the ICS Calendar Files from the Outlook Desktop App?
Step 1. Open Outlook Desktop App.
Step 2. Select the “Calendar” tab at the bottom of your screen.
Step 3. Select File >> Choose “Save Calendar” >> Type Name >> Hit Save.
How to Migrate ICS Calendar to Office 365 Using MS Outlook Desktop App?
For this approach, there are some prerequisites that one needs to ensure:
- You must have MS Outlook Desktop App
- The Office 365 account must be configured with POP configurations.
- You must have .ics files to migrate to an Office 365 account.
Now follow the below steps for the same:
Step 1. Once you have successfully configured your Office 365 account. Then, launch MS Outlook on your computer. In Outlook, navigate to the File tab at the top left corner.
Step 2. Select Open & Export and then click on Import/Export.
Step 3. In the Import and Export Wizard, choose Import an iCalendar (.ics) or vCalendar file (.vcs) and click Next.
Step 4. Browse to the location where you saved the ICS file and select it.
Step 5. Choose the calendar to which you want to import the events. You can either select an existing calendar or create a new one. Then click on OK.
Step 6. Now choose the import option from the popup wizard.
Step 7. Click Next and then Finish to complete the import process. Then, you can search the calendar in your Microsoft 365 account. 
How to Import ICS files to Office 365 Account using Outlook OWA?
Step 1. Log in to your Microsoft 365 account and open Outlook on your browser.
Step 2. Navigate to the top left corner of the screen and click on the App Launcher or nine-dot icon.
Step 3. It will open the apps tab, where you can see different tools offered in your subscription plan. Click on the Calendar option.
Step 4. Now, the Calendar view is displayed on the screen. Navigate to the left-hand pane and click on the Add Calendar button.
Step 5. It will open the Add Calendar Wizard. Here, you can see the different ways using which you can easily create or view or upload calendars in Office 365.
Step 6. In the Add Calendar popup window, click on the Upload from file option.
Step 7. Now, click on the Browse button and select the .ics file. Now click on the Open button and then click on the import.
Step 8. Once the .ics file gets imported into Outlook, then it will display a popup as shown below.
Automate Outlook to Office Calendar Transfer
The SysTools Office 365 Import tool is purpose-built to handle all workload import scenarios. So any admin who needs to transfer a large volume of calendar events from user Outlook profiles into their cloud equivalent can do so easily with the help of this tool.
The tool grants the ability to set up filters before the transfer based on start/end date and user account. Moreover, they can also add priority marks to certain accounts to put their data in the cloud at the earliest.
This, combined with the
To use the tool, follow these steps.
Step 1. Complete the installation on your workstation. Open the tool and Select Outlook (if your calendar is in PST format, otherwise select File System for ICS calendar files) as the Source and Microsoft 365 as the destination.
Step 2. Then, scroll to the workstation and select calendar workloads. Apply the date filter if you need it and press Next.
Step 3. In the source page, browse for the parent folder where all the calendar data is kept. Validate it and Press Next.
Step 4. Then, on the Target page, add the Office 365 admin ID and corresponding application ID. After that hit Validate.
Step 5. Map the users with any one of the available methods out of Fetch, Import and Download.
Step 6. Take a look at the user list, select, prioritize, validate, and start the transfer of calendars from the local system to the cloud.
The Bottom Line
Oftentimes, admins or other users are required to migrate Outlook calendar to Office 365 cloud. By doing this, all the desired data is saved on a secured platform, i.e., Office 365. Moreover, it makes it easier to organize schedules and events. You can perform this task by using any of the above methods, some automated software can also help you automate the task. Choose the right approach accordingly.
Frequently Asked Questions
Q. How many calendars can I add simultaneously with the manual process?
The manual method is limited to one calendar per import session. That too on a single account, there are no quick steps or fast forward methodology you have to repeat the entire process for every user individually. On the other hand, the tool can handle multi-account transfer. The only limiting factor is your bandwidth.
Q. Is there any way to migrate the Outlook calendar to Office 365 programmatically?
Yes, admins with the necessary technical knowledge can use PowerShell:
New-MailboxImportRequest -Mailbox user@yourdomain.com -FilePath "\\servername\sharename\calendar.pst" -TargetRootFolder "Calendar"