I want to make a 2X3 foot poster and then print it in as many 8½"x11" sheets of paper as it takes. Does MS Word let you span multiple pages that way?
Depends on how you make the poster. You can’t do it with a single image.
There was a question like this recently and someone suggested some free software (I think it was called masticator?) that took any image and generated a PDF file that would print it as a poster on multiple pages. I was going to search for you but thought that “poster” might produce a zillion hits for the meaning of “one who posts.”
What you need is a Rasterbator!
Rasterbator?
Problem is that it breaks things up into dots (rasterizes).
Because it chews up the image?
Hang on a sec. All images are dots. What do you mean? It used to be that we split graphic images into two categories, vector for line drawings and raster for pixels. Things have gotten a lot more sophisticated since then, but still, GIF, JPG, and BMP, for example, are still raster standards. I think some formats used for clip art are vector fomats, which scale very well.
:smack:
I guess it whacks off the image. 
As noted unless the picture is a vector graphic (which most aren’t) then all it is is dots. If you expand a typical JPG to huge size you are going to get a Seurat-like picture. Just the nature of the beast (computers try to be clever about it in filling in the gaps but if you have ever done this you know the results leave a lot to be desired).
That can be mitigated by using a very high resolution picture. The more info present the more there is to fill in the “gaps” as the picture gets bigger. For graphics you can use a vector format (eg .SVG) which scale exceptionally well. Downside there is they tend to be huge file sizes and are only graphics and not photos.
To the OP remember that printers cannot print to the edge of the paper so you will have a bit of border to cope with (can be seen in the examples on their website). Not sure if you can trim off those edges to make a seamless picture or not but that would be a fair bit of work to do well on your part.
Let us know how it goes! Kinda curious…
Block posters does this. http://www.blockposters.com/
Printers made in the last few years can bleed the image to the edge of the paper.
Ah! To answer my own question, I just discovered you can do this in Excel, so that’s what I’ll do.