To see a Google Calendar and an Outlook calendar together, you link them: each vendor documents a way to show a copy of its calendar inside the other app, and none of the pages we read describe one merged calendar. This guide is for founders who keep one calendar in Google Workspace and one in Microsoft 365. It gives the exact menu names for each direction, the refresh delays Microsoft states, and the places where the pages say nothing, so you know what to rely on before you trust it to prevent a double booking. Everything below comes from Google Calendar Help and Microsoft Support pages we opened on 2026-11-02.
How do you see Google Calendar and Outlook Calendar together?
Subscribe to each calendar from inside the other, using a link. On the Google side that link is called the Secret address in iCal format. On the Outlook side you create an ICS link with Publish a calendar. The copy you get is a linked one that follows the source calendar.
When we read Microsoft's subscribe page on 2026-11-02, it gave two different typical refresh times: about every 3 hours in the personal-account section and about every 6 hours in the Outlook on the web section, each with a warning that a refresh can take more than 24 hours. The Google pages we opened say nothing about how often a calendar added by link refreshes, so we give no number for that side.
There is a second route. Google's page on syncing with computer programs says that in applications which support it, you can add your Google Account through Sign in with Google and then add and edit events from either side. It limits that to some calendar applications. We cover what Microsoft documents about it further down.
Google Calendar in Outlook: copy the secret iCal address
Copy the calendar's Secret address in iCal format in Google, then choose Subscribe from web in Outlook and paste it. Microsoft's page "View your Google Calendar in Outlook" (dated August 19, 2026 in its metadata) gives these steps for new Outlook:
- In Google Calendar, under My Calendars, select the vertical ellipsis to the right of the calendar name.
- Select Settings and sharing, scroll to Integrate Calendar, and copy the Secret address in iCal format.
- In new Outlook, below the calendar grid on the left, select Add calendar, then Subscribe from web.
- Paste the URL and select Import.
Google's own help page reaches the same link through Settings, then Settings again, then the calendar name under "Settings for my calendars", then Integrate calendar. Microsoft's page says nothing about that part, so we do not claim it. In Outlook.com the Microsoft page names the same sequence: Calendar, Add calendar, Subscribe from web, enter the URL, then Import. For classic Outlook the same page describes a one-time import, not a subscription: export the calendar from Google Calendar under Settings and sharing, Export calendar, extract the downloaded .zip file, then in Outlook choose File, Open & Export, Import/Export, import the .ics file and select Open as New. The page warns that the imported calendar is a static snapshot that does not self-update.
On refresh, Microsoft's Outlook.com page (dated April 13, 2026 in its metadata) says a subscribed calendar refreshes when the other calendar changes, that this can sometimes take more than 24 hours, and that updates should happen approximately every 3 hours for a personal account and every 6 hours in Outlook on the web. It also draws a line between subscribing and importing an .ics file: an imported file is a snapshot that is never refreshed, even if the owner changes the calendar. Microsoft's Google page makes the same point about snapshots for classic Outlook.
The privacy caution is Google's. Only you should know the Secret address, you should not share it, and the Reset button creates a new address and invalidates the old one. If you use a Google Account for work or school, the same page says your admin may have changed the sharing settings, in which case you ask the admin. If you would rather publish the Google calendar, Google's page on public calendars says you can limit it to See only free/busy (hide details), and that stopping public sharing usually takes a few minutes but may take up to 4 hours.
Outlook calendar in Google Calendar: publish, then add from URL
Publish the Outlook calendar to get an ICS link, then add that link in Google Calendar with From URL. Google attaches one condition: its page says you can add a calendar by link only if the other person's calendar is public.
For a Microsoft 365 work or school account, Microsoft's page "Share your calendar in Outlook on the web" (dated December 29, 2025 in its metadata) says to select Settings, then Shared calendars, then, under Publish a calendar, choose the calendar and how much detail people can see, and select Publish. Choose the ICS link. For a personal Outlook.com account the page is "Share your calendar in Outlook.com", and the path is Settings, Calendar, Shared calendars, then Publish a calendar. The older Outlook on the web layout uses Calendar publishing under Shared calendars, with a calendar picker and a permissions picker, then Save. The same page warns that calendar sharing may be unavailable, or limited to people in your organization, depending on your organization settings.
On the Google side, the steps are: open Google Calendar in a computer browser, select Add other calendars next to Other calendars, choose From URL, enter the URL of the published calendar and select Add calendar. The calendar then shows under Other calendars.
Here is where we stop and say what the pages do not connect. Microsoft says an ICS link can be used to subscribe through Outlook, and does not name Google as a target. Google says to enter the URL of a published calendar, and does not mention ICS or Outlook. Putting the two together is our reading. Neither company states a refresh interval for this direction on the pages we read. Microsoft also does not list the detail levels at the publish step, so check the options your account shows.
Two routes look tempting and are dead ends according to the pages. If you share an Outlook calendar with a Gmail address, Microsoft says that person can accept only with a Microsoft 365 or Outlook.com account. And Google says Subscribe to calendar cannot subscribe to calendars that are not from Google. A published calendar is one that anyone can view or subscribe to, so treat the ICS link as public. To stop, use Unpublish under the same Shared calendars settings.
Which menu does what: the direction table
Each direction has its own click path and its own limits, and the pages leave several cells empty. We wrote "not documented on the pages we read" wherever that is the case.
| Feature | Where to click in Google | Where to click in Outlook | What you see and its limits |
|---|---|---|---|
| Google into Outlook, by link | Settings, Settings, calendar name, Integrate calendar, copy the Secret address in iCal format | Add calendar, Subscribe from web, paste the URL, Import | Linked copy. Detail level not documented on the pages we read. Microsoft subscribe page: about every 3 hours (personal) or 6 hours (Outlook on the web), sometimes more than 24 hours. Reset replaces a leaked address. |
| Outlook into Google, by link | Add other calendars, From URL, enter the URL, Add calendar | Settings, Shared calendars, Publish a calendar, choose calendar and detail, Publish, use the ICS link | Google says a link works only for a public calendar. Google refresh: not documented on the pages we read. |
| Outlook shared with a Gmail address | Not applicable | Share on the Calendar toolbar, enter the address, choose a permission | Microsoft says the Gmail user can accept only with an Outlook.com or Microsoft 365 account. It does not end in Google Calendar (our reading). |
| Outlook calendar through Subscribe to calendar | Add other calendars, Subscribe to calendar | Not applicable | Google says you can't subscribe to calendars that aren't from Google. |
| Google account added inside Outlook | Sign in with Google, offered by some applications | File, Add Account, enter the Gmail address, Connect (Outlook for Microsoft 365, 2024, 2021) | Google says sync lets you add and edit events from either side. Microsoft's page covers email and links to a separate Import Google Calendar page. Two-way calendar sync in Outlook: not documented on the pages we read. |
Does adding your Google account in Outlook show the calendar?
The pages we read do not say so. Microsoft's "Set up Gmail accounts" page walks through File, then Add Account, entering your Gmail address and selecting Connect, and describes the goal as viewing and managing your email in one place. Under "Want more?" it links to a separate page on importing Google Calendar. That leaves the link method above as the only calendar path Microsoft spells out for Google calendars.
A four step setup order (our suggestion)
Start with the direction you will use every day, use a link instead of a file, and test before you rely on it. This order is our suggestion, built from the pages above, and we have not run it on live accounts for this post.
- Pick the app where you accept invitations and read your day. Subscribe the other calendar into that app first, using the matching path from the table.
- Use the subscribe option and skip the .ics file import. A file is a snapshot, and Microsoft says it does not refresh.
- Add the reverse direction only if you need it. Publish with the least detail the options allow, and keep both links private: Reset the Google address if it leaks, and Unpublish the Outlook calendar when you stop using it.
- Create one test event in each source calendar and check that it shows up in the copy, then check again after the delays the pages describe. Write down the rule you will follow: new events go into the source calendar so there is one place to edit, and you glance at both before accepting a time.
Where Nolario fits
Nolario is not a calendar sync tool. It pulls Google Calendar into one feed next to Gmail, Outlook mail, Slack and Microsoft Teams, and scores items from 0 to 100 so the one that needs you ranks first. It does not pull Outlook calendars, does not sync calendars between providers, does not create or answer invitations, and never sends anything. It is a desktop web app with no mobile app, and access is by waitlist. If two calendars are your problem, the steps above are the answer. If the trouble is messages spread across channels, see what a unified inbox is, how to check Gmail, Slack and Teams without missing clients and how to combine Gmail and Slack in one inbox, then the integrations and pricing pages.
