1. Create text document
2. Table->Insert->Table
3. Create table with two columns and two rows
4. Select left column
5. Table->Merge Cells
6. You can see a table with a single cell in the left column and two cells in the right
7. File->Save as Microsoft Word 97/2000/XP/2003
8. Close file
9. Open saved file

Expected result: A table with a single cell in the left column and two in the right

The actual result: two cells in the left column and two cells in the right column.

File is generated in a similar way to Microsoft Word opens normally.

There is also a similar problem if the cell split horizontally.

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LibreOffice 3.5.4.2 
Build ID: 350m1(Build:2)

kubuntu 12.04 x86-64