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I'm trying to figure out the best way to meet a user's (Corp-A-User) request to share their calendar with someone at another company (Corp-B-User). We're running Microsoft SBS 2008 with Exchange 2007 and SharePoint. The remote user is running Exchange, version unknown.

Corp-A-User wants to give the Corp-B-User the ability to create appointments on Corp-A-User's calendar. This will naturally require sharing of Free/Busy information. Corp-A-User naturally lacks the vision to seen ANY problem with giving Corp-B-User full access to their calendar. But, I see the problems with that and would prefer that Corp-B-User have only the ability to see Free/Busy and create appointments.

Most of the external publishing options that I have thought of, such as WebDav, allow displaying a user's calendar, but there are problems with security and the ability to create appointments. Right now, I'm thinking the cleanest solution would be to use a Google calendar along with Google Calendar Sync for the two user's Outlook clients. But, I'm not sure if there isn't a better way and I hate teh idea of pushing a corporate calendar up to Google. Not to mention the issues likely to pop up from the multiple sync paths.

Does any one have a good solution for this scenario that would be willing to share what they use?

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2 Answers 2

If Corp-A-User publishes their Free/Busy info via WebDav, Corp-B-User can send a meeting invite. Corp-B-User (and WebDav) won't require any privileges beyond View Free/Busy. This should be sufficient unless Corp-B-User is acting in some sort of personal assistant role and actually managing Corp-A-User's time.

ETA: Even if Corp-A-User doesn't publish their Free/Busy info, Corp-B-User can still send all the meeting invites they like.

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I've done it all, including what you've suggested with GCal which works but is a bit complex.

Exchange 2010 has an option to share calendars in read-only mode from Exchange itself, btw.

In newer versions of Outlook, Auser could send their weekly calendar ("Email Calendar") in email, manually, once a week, and Buser could always invite them to apt's.

I've also seen a setup where Buser with AD account on Auser domain that only has access to Auser calendar and given them the specific OWA url to that users calendar (https://owa.domain.com/owa/auser@domain.com/calendar) (hope I got that right). It takes a few tries to get permissions right, but it can work.

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