We did not migrate until end Jan 2004. I chose to do this "in-house" rather than use consultancy.
In basic steps, the plan was
1 - setup the new CE8.5 server.
2 - migrate the reports from SI7.5 to CE8.5
3 - re-schedule all recurring instances as these were unable to be migrated (very long task !!!)
4 - stop processing on SI7.5 and start processing on CE8.5 as a pre-determined date/time.
There were some issues.
1 - majority of our reporting is from SAP. There were some additional transports needed to the SAP system to allow CE8.5 to communicate with it. Once these were done, SI7.5 would not be able to report against SAP so we could not run the 2 Crystal systems in parallel.
2 - The database logon credentials attached to all reports had changed its format. This meant that they had to be changed manually on each report before they would function against SAP. We were able to get a script written by Crystal to do the bulk of these as it did delay our go-live. We could not validate them real-time as this would have meant out SI7.5 system would be unusable while we were carrying this out.
3 - the re-scheduling of the instances was hampered by having to enter the full SMTP address of the receipients.
All is working fine now, and the CE system is much faster than SI. We have purchased add-on software to enable us to use the Business Calendars function that is not available in CE.
Hope this helps.
Steve