When planning a strategy to take advantage of Zimbra Community and SharePoint, try to make sure to keep latency between the servers as low as possible.
Allow for SharePoint Administrators and Zimbra Community Administrators to make sure that user names and emails match on both systems. When comparing user names, it isn't necessary to have the domain name prefixed in Zimbra Community. In other words, these examples are equal: SharePoint user “corp\user1” and “user1”.
When creating service accounts for Zimbra Community and SharePoint, it is a good idea to make sure the user names, emails, and passwords match.
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