@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
Zarafa has continued to work on the feature richness and total quality of its Zarafa Collaboration Platform (ZCP) for both users and administrators. ZCP 7.1 delivers enterprise features like new clustering capabilities which help to increase uptime and data availability.
ZCP 7.1 marks a wave of product innovation over the last months including Z-Push 2.0 and WebApp 1.1. To serve our customers and partners with better communications software, Zarafa will continue to keep this innovation momentum.