According to Microsoft Embedded developer Centre Pocket Outlook model
Quote:
Maximum/Minimum Dates for Calendar Entries
These constants define the maximum and minimum date values for Calendar entries.
Constant Value Description
CAL_MAXDATE (DATE) 401768 12/31/2999
CAL_MINDATE (DATE) 0 12/30/1899
DATE_NONE (DATE) 949998 1/1/4501
Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later
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Could it be because "01/01/1601" is out of range?