Forgive me for asking what may appear to be a stupid question.

Who reads a document that's 32,000 pages long?

There's never been a limit to the number of pages in a Word doc,
because a page is kind of a virtual thing and can widely vary in
size/content. The size limts are more related to bytes or the capacity
of your own system's resources.

Sadly, finding info on the Limits of Word in Word 2003's help files is
impossible for all I've discovered. But going back to previous
versions, you can type LIMITS OF WORD and get your answer. So looking
back to Word XP (since you didn't mention which version you are
using!), you'll see the limits listed below for that version. If that
is not your version, hit F1 and type LIMIT to find your list.

Dian D. Chapman, Technical Consultant
Microsoft MVP, MOS Certified
Editor/TechTrax Ezine

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Limits for Word (XP)
******************
Some of the content in this topic may not be applicable to some
languages.

The following are the operating parameters and their limits for
Microsoft Word.

Number of open windows
Limited only by available memory

Maximum file size
32 megabytes (MB)

Number of words in custom dictionaries
5,000

Maximum custom dictionary file size
65,593 bytes

Length of bookmark names
40 characters

Number of bookmarks per document
16,379

Length of AutoText entry names (including spaces)
32 characters

Number of AutoText entries per document template
Limited by template file size and/or available memory

Number of global AutoText entries
Limited by template file size and/or available memory

Length of style names
255 characters

Number of styles per document or template
10,000

Number of fields per document
32,000

Number of general switches in a field
10

Number of field-specific switches in a field
10

Number of nesting levels for fields
20

Number of subdocuments in a master document
255

Number of columns in a table
63

Number of newspaper columns
45 (number of columns is affected by page size and margin settings)

Number of tab stops set in a paragraph
64

Number of smart tags
32,752

Minimum page height
0.1 inch

Maximum number of cascading style sheets linked together
11

Maximum page height
22 inches

Minimum page width
0.1 inch

Maximum page width and table width
22 inches

Number of custom toolbars
Limited only by available memory

Number of custom toolbar buttons
Limited only by available memory

Number of characters per line
768

Minimum font size
1 point

Maximum font size
1,638 point (22 inches)

Number of fonts per document
32,767

Amount of space between characters
1,584 point

Distance text can be raised or lowered
1,584 point

Maximum number of colors in color palette
256

Default cache size
64 kilobytes (KB)

Default bitmap cache (bitmap memory)
1 MB

You'll hit other limits long before you run out of pages. If nothing else,
you'll run out of patience waiting for the damned thing to repaginate.

To add to what the others have said, there may be no limit on the number of
pages in a document (except practical ones), but there is a limit to the
number of pages you can number, and this may well be 32,768 (or
32,000-some-odd, anyway). For higher page numbers, you have to use
calculated fields.