One calendar for every system your company uses
AddSync Sync keeps calendars, contacts and tasks in step between Exchange Server, Microsoft 365, Google, Apple, HCL Domino and Zoom. Nobody books twice, and nobody copies a meeting by hand.
Choose your systems
Each system has its own page with the steps, the limits and the questions people ask.
Exchange Server
Exchange 2016, 2019 and Subscription Edition. One service user, no mailbox passwords.
Calendar, contacts, tasksSee details →365Microsoft 365
Microsoft 365 calendars next to your servers and other clouds.
Calendar eventsSee details →OOutlook.com
Outlook.com and Outlook Live calendars next to the work calendar.
Calendar eventsSee details →GGoogle Calendar
Google Calendar and Gmail users, in step with the rest.
Calendar eventsSee details →DHCL Domino
Domino stays on your server and talks to Exchange and the cloud.
Calendar, contacts, tasksSee details →iCApple Calendar
iCloud calendars and contacts, for people on iPhone and Mac.
Calendar, contactsSee details →ZZoom
A Zoom link added in Outlook, or a meeting made in Zoom, shows in every calendar.
Meeting linksSee details →CWebDAV and CalDAV
Your own calendar server stays, and syncs with the rest.
Calendar eventsSee details →What syncs on each system
Any system can be paired with any other.
| System | What syncs | Page |
|---|---|---|
| Exchange Server | Calendar, contacts, tasks | Sync for Exchange Server |
| Microsoft 365 | Calendar events | Sync for Microsoft 365 |
| Outlook.com | Calendar events | Sync for Outlook.com |
| Google Calendar | Calendar events | Sync for Google Calendar |
| HCL Domino | Calendar, contacts, tasks | Sync for HCL Domino |
| Apple Calendar | Calendar, contacts | Sync for Apple Calendar |
| Zoom | Meeting links | Sync for Zoom |
| WebDAV and CalDAV | Calendar events | Sync for CalDAV |
iCloud tasks are not supported. CalDAV covers calendars only. Contacts and tasks sync where both systems support them.
You choose the direction
Set it for every source, and change it whenever you like.
One way
Keep one calendar as the master, and copy it to the other. Good for a read-only view.
The other way
Bring the second system into the first without changing it.
Both ways
Add or change a meeting in either place and both agree. Good for teams that work in two systems.
Common situations
Where companies use Sync most.
Hybrid mail
Mailboxes on your servers and in the cloud, with one view of every calendar.
A move away from Domino
Keep people productive while the company moves in stages. See Domino.
Two clouds after a merger
Colleagues in two companies see each other as free or busy.
One day, two calendars
Private appointments sit next to work meetings, in the direction you choose.
How it works
- Connect your systemsConnect Exchange with one service user, or the cloud systems through the administrator.
- Add your peopleAdd them one by one or from a list, up to the number of licenses. They get an email invite.
- Choose the directionPick one way, the other way or both ways for every source. The calendars follow.
Sync is an add-on to AddSync AI
AddSync AI lets your people use Claude or ChatGPT with their mail and calendar under your rules. Add Sync when you also want calendars, contacts and tasks to stay in step between systems.
Same systems. One administrator. One place to set the rules.
Sync questions
Which systems can AddSync Sync connect?
Exchange Server 2016, 2019 and Subscription Edition, Microsoft 365, Outlook.com, Google Calendar, Apple Calendar (iCloud), HCL Domino, Zoom and CalDAV or WebDAV calendar servers. You can connect any of them with any other.
What does Sync copy between systems?
Calendar events for every system. Contacts and tasks where both systems support them, for example Exchange Server and HCL Domino. iCloud tasks are not supported, and CalDAV covers calendars only.
Can I choose which way data flows?
Yes. For every source you choose one way, the other way or both ways.
Do I need mailbox passwords?
No. For Exchange Server, one dedicated service user with limited permissions is enough, so nobody shares mailbox passwords. Other systems sign in with the person own account after an email invite.
How do my people get started?
Your administrator adds them one by one or from a list, up to the number of licenses. They get an email invite and sign in once.
Is Sync for private users?
No. AddSync is built for businesses and IT teams.
Can I use Sync together with AddSync AI?
Yes. Sync is an add-on to AddSync AI, and both work with the same systems.
Try AddSync Sync with two of your systems
Connect two calendars and see them agree. Switch it off any time.
