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Sync global address list and free busy between partner

SAM2009
SAM2009 asked
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Hi,

I have 3 patners  and they have their own  email servers and domain:

Partner01: O365
Partner02: O365
Partner03: Gmail
Me: O365

We want to be able to sync our contact in Global Address List and free-busy

What is the best too or application for that?
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Most Valuable Expert 2015
Distinguished Expert 2019
Commented:
Free busy you can share via Org relationships: https://docs.microsoft.com/en-us/exchange/sharing/organization-relationships/organization-relationships

Contacts/GAL cannot be shared, you will need a "synchronziation" solution that copies them between the organizations. GalSync is the usual tool of choice, there are some others on the market as well, look them up.

Author

Commented:
If I share free-busy by Org relationship is external users can my employees email address?
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Most Valuable Expert 2015
Distinguished Expert 2019

Commented:
Not sure what you meant here, can you rephrase?

Author

Commented:
Sorry forget my last question:-)

My concern is about other organizations which don't use MS Exchange or O365, like Gmail server.

1- How can I share free-busy with them?

2- Is GalSync works with Gmail server too ?

Thanks
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Most Valuable Expert 2015
Distinguished Expert 2019

Commented:
You cannot share with non-Exchange organizations.

Author

Commented:
Thank you Vasil!