Motorola Droid :: Email Arrives In Outlook On Pc Taking Time?

Sometimes it will be 3 hours between when my email arrives in outlook on my pc and when the droid decides to pick it up (even though i press the refesh button for the email on the droid). when it does come in, it records the time the email should have come in. however, sometimes emails will come in within 1-2 minutes of when they hit my outlook box on my pc. my settings are set to recevie new email every 5 minutes.