Handheld electronic device including appointment and meeting conflict notification, and associated method

An electronic device having a calendar application, comprising:

• a display;
• a processor;
• and
• a memory storing a plurality of existing calendar entries of said calendar application, said calendar application having a calendar cache associated therewith, said calendar cache previously created from an external database and storing a first subset of said existing calendar entries falling within a first date range, said memory storing one or more routines executable by said processor, said one or more routines being adapted to:
• (a) receive information relating to a new calendar entry, said information including a date of said new calendar entry;
• and
• perform automatically, without user intervention, the steps of:
• (b) a first step of determining whether said date falls within said first date range of said calendar cache;
• and
• (c) second step of updating said calendar cache from said external database only if said date falls outside of said first date range to create an updated calendar cache by replacing said first subset of said existing calendar entries with a second subset of said existing calendar entries falling within a second date range, said second date range covering a predetermined time period including said date.