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Share free/Busy with External Company

Hello
How can 2 companies share free/busy information with each other? Each company has about 100 users each and each has their own email servers and they all need to see each other's free/ busy schedules.
One has Exchange 2007, the other has a Linux based email system.

How can the companies share calendars, specifically free/busy info?

Chris

would need to know exactly what the other email system is. It might be possible to share it but there are only certain systems that it will work with.

mechanicus01

ASKER

Ok, please share which and how?

Chris

please state which email system is on the other side

mechanicus01

ASKER

Send mail

mechanicus01

ASKER

Any news?

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Chris

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mechanicus01

ASKER

I've tried that but as far as I know it works from email clients such as Outlook. Which servers do you know of that would work?
I read about Zimbra having this functionality.

mechanicus01

ASKER

Sharing from the server side is what I am looking for.
Question: would Internet Calendar Sharing work for Exchange OWA users?

Chris

If they had exchange it would be easy. Domino would do it
http://www.shudnow.net/2009/02/23/exchange-2007-and-domino-freebusy-coexistence/

zimba would do it -http://wiki.zimbra.com/wiki/Setting_Up_Free_Busy_Interop_with_Exchange_2007

mechanicus01

ASKER

Half the users are Exchange, the other half is sendmail. They will share the same Active Directory.

Chris

well you are limiting yourself by having the sendmail. why not role out Exchange every where.
If there is a reason for having sendmail then that could be worked in while still having all users on exchange

mechanicus01

ASKER

Could sendmail users configure Outlook to publish Free/busy info to Exchange public folders?

mechanicus01

ASKER

Thanks