How to Import ICS to Office 365 Without Any Loss of Data?

Anurag | Modified: October 14, 2022 | Office 365, User Management | 4 Minutes Reading

Are you fed up with looking a perfect and reliable solution to import iCalendar to Office 365 account? Are you aware of the simple method to add ICS to Office 365 in just a few number of clicks? If no, then in this post, apart from the manual method that has some limitations, you will get to know about an easy solution for the same. However, in this post, both the methods are discussed, you can choose between them accordingly.

This calendar is the universal format used to store the calendar file in the ICS format. It is basically a plain text file that contains all its related details like beginning and ending times, title, description of the event, location, etc. This file format is mainly used to send meeting invitations and is used by several email applications like Outlook, Lotus Notes, Gmail, Mozilla Thunderbird, etc. But in some circumstances, a user needs to switch from one email client to another, for example, Office 365. In addition, to open and access calendars anywhere a user wants, one needs to import ICS to Office 365 account. In this, how to add iCalendar to Office 365 account is discussed with all possible solutions.

How to Import ICS to Office 365 Using Manual Method?

Switching from a desktop-based application to a web-based application is always beneficial. After this, it becomes easy for the user to access calendars anywhere they want without any hassle. Now, to import iCalendar to Office 365 account, a user needs to follow the steps mentioned below:

Step 1: Transfer ICS file into Outlook

To import ICS file of Thunderbird to Exchange Online, a user first needs to move ICS file to Outlook and after that, import it to Office 365.

  1. To begin, you need to go to the location where the ICS file is located and the default location is:
  2. Then, from the Import and Export Wizard, choose Import an iCalendar or vCalendar option and click Next
  3. After that, click on the Browse button in order to add the ICS file, and click on the Open button
  4. 4. Here, two different options are displayed in front of you i.e. Open as New or Import button. You have to select the Import option and start the process. Then, selected ICS files are imported successfully to the Outlook account

Step 2: Export iCalendar file into PST format

  1. Now, choose the Outlook Data File (.pst) to save the ICS file from the Export Wizard dialog, and then, click on the Next button
  2. Then, click on the Browse button to choose the destination location and click on the Finish button
  3. Now, to get the required PST file click on the Browse button
    The Default location on the system is: C:\Users\admin\Documents\Outlook Files\backup.pst

Add Outlook PST file into Office 365 account

After exporting ICS to PST format successfully, it’s time to import Outlook PST file into Office 365 account. Now, to do the same, two manual solutions are available i.e. via Network Uploading and Drive Shipping. But both manuals are very lengthy, time-consuming, and not at all a reliable solution. Therefore, to avoid all such limitations, a user is advised to switch to a professional tool named as SysTools Office 365 Restore.

Step 3: Import ICS to Office 365 Via Office 365 Restore Tool

As discussed above there are various limitations that a user might face while transferring PST to Office 365 account. Thus, to import ICS file from Outlook to Office 365 account, one can take the help of the Office 365 Import tool. This software lets users import PST files to Outlook 365 accounts directly in just a few clicks. It will move all data items stored in PST files, including calendars to Exchange Online in without any hassle. In addition, it keeps all Meta properties intact as original along with attachments. Moreover, a user can easily use this application on any version of Microsoft Windows OS.


Office 365 is a web-based application that offers various services to its users like access to data anywhere, freeing up storage space on the local machine, etc. All such benefits make this application more popular among users. Thus, users want to import iCalendar to Exchange Online to avail all such advantages. As there is no immediate solution, a user first needs to import ICS to PST and after that, import PST to Office 365 via a third-party tool without any loss of data.