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Written By Rohan Wiese
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Updated on September 25th, 2026
Migrate Google Calendar to Office 365: Transfer Calendar Events, Appointments & Meeting Schedules Easily
Albert, IT Admin From California, Asked
Our organization has decided to switch from the Google Workspace to M365 environment. Since there is a large amount of existing calendar data, including shared calendars, that we need to migrate to Microsoft 365 now. But there is a fair chance of losing the important schedules during this transfer; therefore, I’m unsure about the migration method I should proceed with. The native methods can migrate events securely, but it might result in calendar congestion. Suggest a feasible solution to migrate Google Calendar to Office 365 accurately.
Overview: The Google Workspace to Microsoft 365 migration process is not limited to emails and documents. Rather, this process also includes a careful migration of Google Calendar data, like recurring messages, shared team schedules, and event details. You may export a calendar in .ics format, but it will transfer the existing events only, rather than synchronizing them for future exports. Therefore, organizations and working professionals need to understand the available migration methods, their limits, and the post-migration effects on data. This guide covers all of it and explains how to use the Aryson Google Workspace to Office 365 Migration to export Google Calendar to Outlook 365 with maximum accuracy.
What Is Google Calendar to Office 365 Migration?
Migrating your Google Calendar to Microsoft 365/Outlook involves moving all your calendar data out of Google Workspace and into Microsoft’s environment. This data transfer includes supported events, recurring meetings, attendees, descriptions, locations, and lots more relevant scheduling info into Outlook itself. But the migration method you choose will largely decide whether an individual user calendar or multiple calendars are migrated. The native Microsoft methods don’t allow shared calendars or event colors to migrate. Calendar throughput also depends on Google Workspace service-account quota limits.
What Calendar Data Can Be Migrated?
The calendar data that can be transferred to your Outlook depends on the migration method you choose. Google’s iCalendar export contains several core event attributes, while Microsoft’s native Google Workspace migration has its own supported data and limitations.
| Calendar data | Migration details |
| Event title | Migrated as part of the calendar event information. |
| Start and end time | Included in Google’s iCalendar export. |
| Recurring events | Recurrence-related information is included in the iCalendar data. |
| Event description | Included when available. |
| Event location | Included when available |
| Invitees/attendees | Google’s exported iCalendar data can contain invitees and their response statuses. |
| Attendee response status | Included in Google’s exported iCalendar data. |
| Event creation/modification time | Included in Google’s iCalendar export data. |
| Shared calendars | Not migrated by Microsoft’s native Google Workspace migration. This is particularly important for organizations using departmental or team calendars. |
| Event colors | Not migrated by Microsoft’s native Google Workspace migration. |
| Meeting-room bookings | Not migrated by Microsoft’s native Google Workspace migration. |
| Calendar permissions/sharing | Should not be presented as automatically migrated by Microsoft’s native migration; sharing/access arrangements may need separate handling. |
How to Securely Migrate Google Calendar to Office 365?
In this section, we’ll focus on all sorts of methods by which a user may transfer their Google Calendar entries over to Outlook itself. The migration method you choose among the methods below will determine which calendar items are migrated. There is no way you can export a calendar from the Google Calendar mobile application. You may try to use all the below-mentioned methods, and if none of the manual ways work for you, a dedicated tool is listed below as well.
Method 1: Export and Import an ICS File
To perform some very basic migrations, you can export your Google calendars into the ICS format and then import those files into Outlook itself. Within this particular workflow, just one calendar at a time can be moved over, and data gets copied rather than synchronized. This means that any new Google events won’t immediately show up in your O365 environment itself.
Note: It is important to enable the “Make changes and manage sharing” permissions to export. Even workspace admins can restrict the export process.
Steps to Migrate Google Calendar to Microsoft 365 are as follows:
- In Google Calendar on the web, open “My calendars,” point to the calendar to export, and select Settings and sharing.
- Under Calendar settings, select Export calendar to download a ZIP file containing an ICS file for that calendar.
- Unzip the file to access the individual .ics file.
- In Outlook, go to File > Open & Export > Import/Export, then choose Import an iCalendar (.ics) or vCalendar file.
- Browse to the .ics file, select Open as New, and confirm the events appear in the Outlook calendar.
Method 2: Subscribe via the Secret iCal Address
This method keeps a linked calendar visible inside Outlook. But it is important to note that it doesn’t transfer calendar ownership/data into Microsoft 365. Also, your Secret iCal URL should be kept secret since anyone who has it will be able to see your calendar feed.
Steps to Migrate Google Calendar to Office 365 are as Follows
- Start by signing in to Google Calendar on your computer.
- After that, select the required calendar you want to subscribe to under “My Contacts.”
- Select the More option, present next to the calendar, and click Settings and sharing.
- Under Integrate Calendar, copy the secret address in iCal format.
- Log into Outlook on the web and then open your calendar.
- Select Add calendar and choose Subscribe from web.
- Paste Google Calendar’s iCal URL into your calendar address field.
- Choose ‘Import‘ to include your subscribed calendar in Outlook.
- Outlook will occasionally update your subscribed calendar whenever you modify your Google Calendar
Where Does the Manual Method Lag Behind?
- In the ICS export method, only snapshots are created, rather than synchronization.
- Moreover, it might become difficult to manually set up when we migrate multiple calendars.
- Subscriptions don’t transfer ownership into Microsoft 365.
- Subscribed calendars may experience significant update delays.
- Export availability depends on Workspace administrator restrictions.
- Secret iCal URLs require careful security handling.
Enterprise-Level Solution: Aryson G Suite to Office 365 Migration Tool
In addition to the above limitations of the manual methods, these workflows can’t migrate shared team calendars, which is the major concern of most admins. That’s why the Google Workspace to Office 365 Migration is designed in a way that it supports the migration of multiple calendar items, along with shared calendars. The exclusive checkbox to migrate calendars allows users to migrate calendars to Office 365 without any need to convert it into .ics files. The same software can back up Google Workspace data to External hard drive. Even when you have to move recurring events, event descriptions, locations, invitees, event modification times, event colors, or even meeting room bookings, this software will migrate them all.
How to Migrate Google Calendar to Office 365 with Aryson Software
- First, download, install & run the Aryson Google Workspace to Office 365 Backup Tool.
- Select the Mailbox card >> Connect to the source Google account to migrate calendars.
- In the preview panel, select the All Mails option and select Office 365 as the destination.
- Log in to the O365 account and map data items to the mailboxes.
- Now, you have to tick the Calendars checkbox to migrate calendar items.
Untick the contacts, tasks, notes, and emails checkbox to migrate “only” calendar items - At last, click the Start Migration button to migrate G Suite Calendar to Office 365.
Even if you follow the above steps, you can successfully migrate calendar items to Office 365. However, if you go through the detailed documentation of the software, the migration process will become much easier to execute and verify whether you are following the right steps or not.
Real-World Success Story
There was a platform switch company-wide in an organization. Thus, an IT Administrator at a marketing agency needed to migrate shared calendars for 12 different departments. Since there were a large number of calendar items, it was practically not possible to migrate calendar items using the ICS import and export method. Therefore, he tried to use the Aryson Google Workspace to Office 365 Backup Tool to migrate Google & Google Workspace Calendar to Office 365 and migrated all the calendar items within one migration. This eventually saved him a lot of time and effort.
Conclusion
The choice of method to migrate Google Calendar to Office 365 depends on the volume of calendars you need to migrate and whether synchronization is important or not. The manual methods allow users to migrate calendars one at a time and don’t even transfer ownership. Whereas the Aryson Google Workspace to Office 365 Backup Tool lets them migrate calendar items in bulk, along with the shared calendars, event colors, and meeting room bookings.
Frequently Asked Questions
Q.1 Does the software remove duplicate data during migration?
Ans: Yes, the duplicate detection feature of the software skips duplicate data during the migration. This eventually increases the speed of processing and leads to much more accurate results.
Q.2 Can I create a custom folder name for migrated data?
Ans: Yes, with the help of the custom folder name option, it is possible to create a custom folder with a specified name. This folder will appear in Outlook with exactly the name you have specified during migration.
Q.3 Does the tool support advanced filtering before migration?
Ans: You can filter your data based on the To, Subject, From, BCC, CC, and Body fields. You just have to select the required field and enter the value in the textbox provided just below.
Q.4 Is the software easy to use for first-time users?
Ans: Yes, this software is designed in a way that even if a first-time user operates it, they can learn how to use it in one go. This helps organizations to cut the cost of training to train employees on the migration process.
Q.5 How does the software protect data integrity when I migrate Google Calendar to Office 365?
Ans: Yes, when you migrate Google Calendar to Microsoft 365, the preview panel displays all the folders and labels associated with the particular account. You can cross-verify the selected data to make sure only the relevant information is migrated.
Q.6 Can 24×7 chat support help me migrate Google Calendar to Office 365?
Ans: If you feel stuck at any step of the migration process, just reach out for the tech support team. The team is 24/7 available to help you out and assist with any migration related doubts.
About The Author:
Rohan Wiese is a Technical Content Writer at Aryson Technologies, specializing in databases, e-mail recovery, and e-mail migration solutions. He enjoys conducting research and generating information that assists database administrators, businesses, and novices in resolving issues with MS SQL Server, MySQL databases, Cloud Computing, and Microsoft Exchange.
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