BusyCal and BusyContacts are compatible with Exchange 2007 SP3 and later, but BusyMac recommends Exchange 2013, which is more reliable than older versions.

Note: BusyCal does not support outlook.com, nor the home offerings for Office 365. Only full Exchange services are supported, such as Office 365 for business.

BusyCal

BusyCal supports the following Exchange features:

• Calendar Sharing — Each calendar can be shared with multiple users, each with different access privileges (free/busy, read-only, read/write, delegate, etc.).
• Public Calendars — Company-wide public calendars can be subscribed to in BusyCal.
• Free/Busy - Meeting organizers can view attendee availability when scheduling meetings.
• Push — Changes are synced immediately between Exchange and BusyCal via Push.
• Tasks — Tasks can be synced with Exchange and shared with other BusyCal users. Repeating Tasks are supported, either on a fixed interval (e.g. every week on Monday), or dynamically regenerated based on the completion date of the previous Task (e.g. one week after completion).
• Categories — Categories in Outlook are mapped to tags in BusyCal, including support for category colors.
• Notifications — Notifications can be displayed when changes are made on shared calendars.

BusyContacts

BusyContacts supports the following Exchange features:

• Address Book Sharing — Each address book can be shared with multiple users, each with different access privileges (free/busy, read-only, read/write, delegate, etc.).
• Public Address Books — Company-wide public address books can be subscribed to in BusyContacts.
• Push — Changes are synced immediately between Exchange and BusyContacts via Push.
• Categories — Categories in Outlook are mapped to tags in BusyContacts, including support for category colors.
• Notifications — Notifications can be displayed when changes are made on shared calendars.