By default, import libraries (.lib files) made for MSVC are not compatible with Borland C Builder and Borland Delphi. Since version 6 of Borland C++ Builder, there's a tool which can convert these files in COFF format to OMF format. The tool is called coff2omf and resides in the Bin directory of your Borland installation.
Simply run the file as follows (be sure your path etc. is correct):
coff2omf mylib.lib mylib2.lib
Then, use the mylib2.lib file you just created and add it to your project.
Try using this method if you get a linker error like this:
"Invalid OMF record type 0x21 (possibly COFF)"