Simply repeat this process on each computer on which you have Outlook installed. This will configure Outlook's email check frequency, making sure each copy of Outlook is configured with the same time interval to check for email on the email server.

Keeping messages on the server
The next step toward configuring Outlook for our project is to configure Outlook to leave your email messages on the server long enough so that each computer's copy of Outlook will be able to check for the email messages before the email messages are deleted from the server by Outlook.

Unless properly configured, once one copy of Outlook downloads the email from the email server, Outlook will automatically delete the message from the server without giving other copies of Outlook on other computers an opportunity to download the message. It's important that Outlook is configured to leave the message on the server long enough for each copy of Outlook to download the messages before they are deleted from the server by the various Outlook clients.

Here's the secret to the whole process: the time that messages should be left on the server after each message has been downloaded to one computer's copy of Outlook should be long enough so that it exceeds the time interval you have already configured Outlook to check for messages on the email server on each computer.

I suggest leaving email messages available on the server for 3 days before they are deleted from the email server.

If you have set the frequency for new email messages to be downloaded to Outlook on each computer from between the suggested 1 minute to up to 1 hour this will ensure that each computer will download email messages at this frequency and that the messages will be left on the server for a maximum of 3 days before being deleted, giving each computer an opportunity to download the messages into Outlook.

To configure Outlook to leave messages on the server for 3 days and to allow all copies of Outlook on multiple computers an opportunity to download the messages before Outlook purges the messages from the email server, select email Accounts from the Tools menu.

Select the bullet View or Change Existing Email Accounts and select Next. On the Email Accounts properties page, under Outlook Processes Email for These Accounts in the Following Order, select your email account in the box and select the Change button.

On the next properties page, select More Settings. On the Internet Email Settings properties page, select the Advanced tab. Under Delivery, select the checkbox Leave A Copy of Messages on the Server and check the checkbox Remove from Server After and set the value to between 3 and 5 days.

Click Okay on the Internet Email Settings page. Select Next on the Email Accounts properties page and then select Finish. Repeat this process on each computer on which you have Outlook installed.

How it works
What I have done is first configured Outlook on each computer to check the email server every 1 minute for new messages. The next step I took was to configure Outlook on each computer to leave a copy of email messages on the server for 3 days.