In Gmail, search header:X-Google-Calendar-Notification:eventCreated to list calendar invitations sent by Google Calendar. In Outlook on Android and iOS, open the message filter and choose Events. Most guides repeat one Gmail operator and assume Outlook works the same way, so we opened the Google and Microsoft pages on 2026-10-31 and wrote down only what they say, including the gaps: no page we opened documents an invitation filter for Outlook on Windows or the web.
How do you find calendar invitations in Gmail?
Type header:X-Google-Calendar-Notification:eventCreated into the Gmail search box. Google Calendar Help lists eventCreated as the search token for "New event invitation sent", and it works because Google Calendar adds a hidden email header called X-Google-Calendar-Notification that Gmail can read.
The same page gives tokens for the changes that usually follow an invitation: eventCancelled, timeOrRecurrenceUpdated, rsvpAccepted, rsvpDeclined, rsvpTentative and rsvpProposeNewTime. To keep a search, run it, click Show search options on the right of the search box, then click Create filter at the bottom of the window. The page says to turn on the notifications you want in Google Calendar first: Settings, then the calendar name, then Other notifications.
When we opened Google's page of Gmail search operators on 2026-10-31, it listed has: values for attachments, YouTube videos, Drive files, Docs, Sheets and Slides, and a filename: operator for attachments with a certain name or file type (its examples are filename:pdf and filename:homework.txt). We searched the page text for the words invite and ics and found no match, so we do not recommend has:invite here. The page's one calendar reference is its header: row, which points to the Calendar notifications page above.
One limit to keep in mind: the header page describes email that Google Calendar sends. It does not say whether an invitation sent from Outlook or another calendar system carries the header, so for those, fall back to searching by sender or subject.
Does Outlook have an Events filter?
Yes, in Outlook on Android and iOS. Microsoft's roadmap item RM568760, published Aug 4, 2026 and last updated Sep 30, 2026, lists the platforms as Android and iOS and the status as Launched. Its description reads: "You can now filter your messages for calendar invitations. Simply go to the filter and select Events from the drop down."
The matching Message Center item, MC1458484, published Aug 21, 2026, describes a rollout from late August to late September 2026 in Worldwide, GCC and GCC High environments, files it under Exchange Online and says no admin action is required. Its title was changed on Oct 21, 2026 to name Outlook Mobile. If you are on Outlook for Windows or the web and cannot find Events, neither Microsoft page we opened promises it is there.
On a phone the path is the filter drop-down above the message list, then Events. We could not trace a desktop or web menu path to a Microsoft page we opened, so we are not giving one.
Gmail vs Outlook mobile vs Outlook desktop: where to look
The table below is built only from the pages we opened on 2026-10-31. Where a page did not say something, the cell says so instead of guessing.
| Feature | Gmail (checked 2026-10-31) | Outlook on Android and iOS (checked 2026-10-31) | Outlook for Windows and web (checked 2026-10-31) |
|---|---|---|---|
| Where invitations are found | Gmail search box, using the header Google Calendar adds to its emails | Message filter drop-down above the message list | No Microsoft page we opened documents a path |
| Exact step or operator | header:X-Google-Calendar-Notification:eventCreated. Save it: Show search options, then Create filter | Filter, then Events (RM568760) | Not documented in the pages we opened |
| Documented limits | Covers email that Google Calendar sends. Calendar notifications must be on. No has:invite on the operator page | Roadmap lists Android and iOS only, status Launched. MC1458484 covers Worldwide, GCC and GCC High | Unconfirmed: the Events filter is listed for mobile only |
| Pages we opened | Gmail operator list and Calendar notification filters, both Google Help | RM568760 and MC1458484 | RM568760 and MC1458484 name mobile only |
Two honest gaps. The Microsoft pages do not say which Outlook accounts show the filter, for example whether a Gmail or IMAP mailbox added to Outlook gets it. And we found no Microsoft Support page on filtering mail for invitations in Outlook for Windows or the web, so we left desktop steps out. If you manage a company on Microsoft 365, the Message Center item is the page to check against your own tenant.
How do you clear calendar invitations in one pass?
Pull the invitations into one list first, decide in the calendar second, and tidy third. This routine uses only the searches above and works for a Gmail inbox or Outlook on a phone.
- Gmail: search
header:X-Google-Calendar-Notification:eventCreated. Outlook on Android or iOS: open the filter drop-down above the message list and pick Events. - Sort the list by date and read the soonest invitations first.
- Check each one against your calendar for conflicts before answering. If time zones are involved, see how to run Google Calendar across three time zones.
- Answer from your own calendar or mail client, one invitation at a time.
- In Gmail, run
eventCancelledandtimeOrRecurrenceUpdatedto catch changes you missed. - Save the search as a Gmail filter that applies a label. Google's page also offers archive and delete as filter actions, so choose the label if you do not want invitations to disappear. For a wider setup, read how to set up priority rules in Gmail and Outlook.
Where Nolario fits
Nolario is our product, so weigh this section accordingly. It pulls Gmail, Outlook, IMAP, Slack, Teams and Google Calendar into one feed, scores every item from 0 to 100 and ranks the feed. An invitation that arrives as mail sits in that same ranked feed as the rest of your mail and the calendar. If you run an Outlook inbox and a Gmail inbox side by side, the Outlook unified inbox guide covers the native options, and checking Gmail, Slack and Teams without missing clients covers the wider picture.
The limits are plain. We do not claim Nolario recognizes an invitation as one, and it never sends, accepts or declines anything: you respond in your calendar. It is a desktop web app, there is no mobile app, and access is by waitlist. See the integrations and pricing pages. If you only need the invitation list today, the Gmail search above is enough, and the Outlook Events filter covers the phone.
