Sync Microsoft 365 calendars with Exchange Server and Gmail
Your colleagues work in different systems. Your calendar should not care. Everyone sees the same meetings, wherever they were created.
In short: AddSync Sync connects Microsoft 365 calendars with Exchange Server, Google Calendar, Outlook.com, Apple Calendar (iCloud) and HCL Domino. You invite your people by email, they sign in with their Microsoft account, and you choose the direction for every source.
What changes for your people
One view of the week
Meetings from Microsoft 365, Exchange Server and Gmail sit in one calendar. Nobody has to open three to find a free hour.
Both ways
A meeting created in Microsoft 365 reaches the other calendars, and the other way round.
No double bookings
When everyone sees you are busy, nobody books you twice.
Invite, not password
You send an email invite. Your people sign in themselves.
You set the size
Add as many people as the licenses you bought.
While part of your company is still on Exchange
Many companies run Microsoft 365 and Exchange Server side by side for a long time. Here is what that looks like with and without a sync.
Without sync
- Two calendars to check before you book a meeting
- The same meeting typed in twice
- Colleagues double-booked across systems
With AddSync Sync
- One picture of the day in the calendar you open first
- A meeting created once shows everywhere
- Direction set for each source, you stay in control
Connect your people in four steps
Add people
One by one or by list import.
Send the invite
An optional email invite.
They sign in
With their Microsoft account.
Pick the direction
One way, the other way or both.
Microsoft 365 at a glance
| Sign-in | Microsoft account, after an optional email invite |
| Direction | One way, the other way or both ways, set per source |
| Syncs with | Exchange Server 2016, 2019 and SE, Outlook.com, Google, HCL Domino, Apple Calendar (iCloud), CalDAV |
| Meetings | Zoom links travel with the meeting |
| Added by | One by one or by list import |
Acme Corp: 25 people on Microsoft 365, 15 still on Exchange
Olivia Hayes moves to Microsoft 365 first. Her colleague Liam Brooks still works in Exchange Server. Both see the same Tuesday, and neither double-books the other.
Microsoft 365 sync questions
Can I sync Microsoft 365 calendars with an on-premises Exchange Server?
Yes. AddSync Sync connects Microsoft 365 with Exchange Server 2016, 2019 and Subscription Edition, and with Google Calendar, Outlook.com, Apple Calendar (iCloud) and HCL Domino.
How do my people connect their Microsoft 365 account?
You add them one by one or import a list, and you can send an optional email invite. Each person signs in with their Microsoft account. You do not collect passwords.
Can I sync in one direction only?
Yes. For every source you choose one way, the other way or both ways.
What happens when half of my company still uses Exchange Server?
Both groups see the same meetings. A meeting created in Microsoft 365 shows in the Exchange calendar, and the other way round, if you choose both ways.
Does AddSync sync contacts and tasks as well?
AddSync syncs calendar events, contacts and tasks for the sources that support them, such as Exchange Server and HCL Domino. Ask us about your exact combination.
How many people can I add?
As many as the number of licenses you bought.
Is AddSync for private users?
No. AddSync is built for businesses and IT teams.
Sync Microsoft 365 with other systems:
Want AI for your Microsoft 365 mailbox? See AddSync AI for Microsoft 365.
One calendar for a mixed company
Start a trial and connect your first Microsoft 365 source.
Microsoft, Microsoft 365 and Exchange are trademarks of the Microsoft group of companies. AddSync is an independent product. Names Olivia Hayes, Liam Brooks and Acme Corp are examples.
