If you find that you have contacts that are duplicated, Act! for Web has a method to combine them:

- Click on the Tools menu and select Scan for Duplicates.

- Select the fields that you want to use to determine if a contact is a duplicate (for most users this will

   be Contact, Company, and Phone).  Click OK.

- If any duplicates are found, click Yes to continue.

- Click Next.

- Select the first record to be merged, then hold the CTRL key and select the second record.  Click Next.

- Select the source and target records and then click Next.

- Select any fields that you wish to copy and then click Next.

- Check/uncheck any additional items that you want to move to the destination contact and then

   click Next. 

- Specify whether to keep the source record or delete it, click Next, and then click Finish.