Producing the series of tags that result in a table within a post is very tedious: you have to create a tag pair for the table as a whole, a tag pair for each row in the table, and a tag pair for each cell within each row.
The macro Table2Lounge in the attached text file will convert a (simple) table in a Word document into the code needed for inclusion in a post.
You can copy the macro into a code module in Word; if you copy it into a module in your Normal template, it will be available in all posts.
To convert a table, click anywhere inside it, then run the macro (Alt+F8 displays the Macros dialog in all versions of Word).
Example:
Here is a screenshot of a table in a Word document:
Clicking inside it (in Word) and running the Table2Lounge macro places the following code on the clipboard, ready to be pasted into a post:
[table=1][tr=bottom][td=left]Mary
had[/td][td=left]a[/td][td=center]little[/td][/tr][tr=middle][td=right]lamb[/td][td=left]and
its[/td][td=left]fleece[/td][/tr][/table]
When posted, this results in:
| Mary had | a | little |
| lamb | and its | fleece |
Warning: if your table contains merged cells, you'll get an error message. The macro was not intended to handle merged cells, since the table tags in the Lounge don't support them.