[tsac]

The DM options may be set wrong. It is possible to delete PC data or BB data depending on options set.

Configure your contact synchronization options
Before you can synchronize your contacts between your BlackBerry smartphone and your computer, you need to configure your synchronization options.
Connect your smartphone to your computer.
In the BlackBerry Desktop Software, click Organizer.

Click Configure beside Contacts.

In the Sync direction drop-down list, do one of the following:

To keep contact entries the same on your smartphone and your computer, click Two way between your device and computer.

To synchronize updates to the contact entries from your computer to your smartphone, click One way to your device only. To replace all entries on your smartphone with the entries on your computer, select the Replace all entries on your device with the entries on your computer checkbox.

To synchronize updates to the contact entries from your smartphone to your computer, click One way to your computer only. To replace all entries on your computer with the entries on your smartphone, select the Replace all entries on your computer with the entries on your device checkbox.
In the Account Settings section, in the Contacts account drop-down list, click the contacts application that you use on your computer.
Click Configure. Do one of the following:
If you use Microsoft Outlook, in the Outlook Profile drop-down list, click your profile.
If you use IBM Lotus Notes, click Browse to select your .ini file. If necessary, type your password. If you don't want to be prompted for a password, clear the Prompt at every sync checkbox.
Click Close > OK.