The following steps release the memory from C: drive:
- Delete or move all possible images, music etc. content to the E: drive.
- Uninstall unnecessary applications from C: drive and/or reinstall them to E: drive.
- Uninstall QuickOffice as Microsoft Office Mobile replaces it.
- Uninstall Microsoft Office Communicator in case you can use Microsoft Lync instead. Note: Whether to use Microsoft Communicator or Lync depends on the backend the your company infrastructure has.
If the you don't use one of Microsoft Applications, you can uninstall them separately. For example Microsoft Lync, go to Settings > Installations > Already installed and remove Microsoft Lync apps.
See the following FAQ first: Why doesn’t the Lync app work with my corporate Lync account? The Lync application in PC works fine.