Please make sure you are running the latest version of the WinSMS desktop client.
Open the WinSMS desktop client.
On your contacts page, you have filters for your contact fields and you can use these to search for information.
Click in the filter box above the field you want to find information in and type all or part of what you looking for and press the enter key on your keyboard.
This will search the selected field for information that contains your search query. So if we search for Joe in the first name field the WinSMS desktop client will find any first name that is joe or contains joe and return those results.
To remove the filter either clear the filter box and press enter or click on the remove contact filter button.
The filter is available in all folders - Contacts, Inbox, Pending, Scheduled, Sent Items and Deleted Items.
You can use the filter for any additional contact fields you have added. For more information on how to add and use an additional contact field please go here