Sperry Software :: Schedule Recurring Email prompts the error message:"Cannot read one instance of this recurring appointment. Close any open appointments and try again."

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Schedule Recurring Email prompts the error message:"Cannot read one instance of this recurring appointment. Close any open appointments and try again."

Problem:
Using Schedule Recurring Email (and Outlook 2003 or better), an error occurs that says: "Cannot read one instance of this recurring appointment. Close any open appointments and try again."

Solution:
If connected to Exchange, turn on cache mode.

Comments:
A friendly system administrator found this solution and shared it with us. His Cached Mode was off - he turned it on - and Schedule Recurring Email started working. It looks like an error specific to the Exchange version, not the Outlook version.